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Tangents- Definition Geometric Constructions A line is a tangent to a circle if it touches the circle at only one point

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Page 1: Tangents- Definition Geometric Constructions A line is a tangent to a circle if it touches the circle at only one point

Tangents- DefinitionG

eom

etric

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ctio

nsG

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etric

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A line is a tangent to a circle if it touches

the circle at only one point

Page 2: Tangents- Definition Geometric Constructions A line is a tangent to a circle if it touches the circle at only one point

Tangents- DefinitionG

eom

etric

Con

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ctio

nsG

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etric

Con

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Two curves are tangent to each other if the

touch in one and only one place

Page 3: Tangents- Definition Geometric Constructions A line is a tangent to a circle if it touches the circle at only one point

Geo

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Geo

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Tangents- Geometric location of tangent point

The tangent point of a straight line and circle will lie at the

intersection of a perpendicular to the straight line that passes

through the center of the circle.

Page 4: Tangents- Definition Geometric Constructions A line is a tangent to a circle if it touches the circle at only one point

Geo

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Geo

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Tangents- Geometric location of tangent point

The tangent point of two circles will lie on the circumferences

of both circles and on a straight line connecting the circle

centers

Page 5: Tangents- Definition Geometric Constructions A line is a tangent to a circle if it touches the circle at only one point

Straight Line Tangents to a Circle from an External point

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Tangents- Construction

Page 6: Tangents- Definition Geometric Constructions A line is a tangent to a circle if it touches the circle at only one point

Straight Line Tangents to a Circle from an External point

Geo

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Geo

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Tangents- Construction

Page 7: Tangents- Definition Geometric Constructions A line is a tangent to a circle if it touches the circle at only one point

Rr

R-r

R-r

Common Parallel Straight Line Tangents to Two Circles of Radius ‘R’ and ‘r’

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Geo

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Tangents- Construction

Page 8: Tangents- Definition Geometric Constructions A line is a tangent to a circle if it touches the circle at only one point

Rr

Common Parallel Straight Line Tangents to Two Circles of Radius ‘R’ and ‘r’

Geo

met

ric C

onst

ruct

ions

Geo

met

ric C

onst

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ions

Tangents- Construction

Page 9: Tangents- Definition Geometric Constructions A line is a tangent to a circle if it touches the circle at only one point

Rr

R+r

R+r

Common Cross Straight Line Tangents to Two Circles of Radius ‘R’ and ‘r’

Geo

met

ric C

onst

ruct

ions

Geo

met

ric C

onst

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ions

Tangents- Construction

Page 10: Tangents- Definition Geometric Constructions A line is a tangent to a circle if it touches the circle at only one point

Rr

Common Cross Straight Line Tangents to Two Circles of Radius ‘R’ and ‘r’

Geo

met

ric C

onst

ruct

ions

Geo

met

ric C

onst

ruct

ions

Tangents- Construction

Page 11: Tangents- Definition Geometric Constructions A line is a tangent to a circle if it touches the circle at only one point

R

R

R

R

Circular Tangent of Radius ‘R’ Between a Point to a Straight Line

Geo

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Tangents- Construction

Page 12: Tangents- Definition Geometric Constructions A line is a tangent to a circle if it touches the circle at only one point

R R

R

R

R

Circular Tangent of Radius R Between Two Straight Lines at an Angle

Geo

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Geo

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Tangents- Construction

Page 13: Tangents- Definition Geometric Constructions A line is a tangent to a circle if it touches the circle at only one point

R

R

R

R+r r

R

R R

Internal Circular Tangent of Radius ‘R’ Between a Straight Line and a Circle of Radius ‘r’

Geo

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Geo

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Tangents- Construction

Page 14: Tangents- Definition Geometric Constructions A line is a tangent to a circle if it touches the circle at only one point

R

R

R

R-r r

R

R

R

R-r

External Circular Tangent of Radius ‘R’ Between a Straight Line and a Circle of Radius ‘r’

Geo

met

ric C

onst

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ions

Geo

met

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ions

Tangents- Construction

Page 15: Tangents- Definition Geometric Constructions A line is a tangent to a circle if it touches the circle at only one point

R+r1

r2

R+r2

R

r1

R+r1

R+r2

R

Internal Circular Tangent of Radius ‘R’ Between Two Circles of Radius ‘r1’ and ‘r2’

Geo

met

ric C

onst

ruct

ions

Geo

met

ric C

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Tangents- Construction

Page 16: Tangents- Definition Geometric Constructions A line is a tangent to a circle if it touches the circle at only one point

R-r1

r2

R-r2 R

r1

R-r1

R-r2

R

External Circular Tangent of Radius ‘R’ Between Two Circles of Radius ‘r1’ and ‘r2’

Geo

met

ric C

onst

ruct

ions

Geo

met

ric C

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Tangents- Construction

Page 17: Tangents- Definition Geometric Constructions A line is a tangent to a circle if it touches the circle at only one point

R-r1

r2

R+r2R

r1

R-r1

R+r2

R

Cross Circular Tangent of Radius ‘R’ Between Two Circles of Radius ‘r1’ and ‘r2’

Geo

met

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onst

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ions

Geo

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Tangents- Construction

Page 18: Tangents- Definition Geometric Constructions A line is a tangent to a circle if it touches the circle at only one point

Basic Sketching Line types

Visible Object – ThickVisible Edges and Outlines

Hidden – ThinHidden detail for like wall

thickness and holes..

Center - Thin centre of a circle, cylindrical

features, or a line of symmetry.

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1mm3mm

1mm

3mm15-20mm

0.7mmHB

0.3mm2H

0.3mm2H

Page 19: Tangents- Definition Geometric Constructions A line is a tangent to a circle if it touches the circle at only one point

Line Types An Example:

1. Visible

2. Hidden

3. Center

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Page 20: Tangents- Definition Geometric Constructions A line is a tangent to a circle if it touches the circle at only one point

Intersection of Lines

Solid Line Intersections

Dashed Line Intersections

GapGeo

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Page 21: Tangents- Definition Geometric Constructions A line is a tangent to a circle if it touches the circle at only one point

Hidden Line ConventionsG

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etric

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nsG

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Page 22: Tangents- Definition Geometric Constructions A line is a tangent to a circle if it touches the circle at only one point

Hidden Line ConventionsG

eom

etric

Con

stru

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nsG

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etric

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Page 23: Tangents- Definition Geometric Constructions A line is a tangent to a circle if it touches the circle at only one point

Centerline Conventions

Extend 5mm

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Geo

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Page 24: Tangents- Definition Geometric Constructions A line is a tangent to a circle if it touches the circle at only one point

Geo

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Geo

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Lettering : Basic Strokes

Straight Slanted CurvedHorizontal

1 1 2

3

“I” letter “A” letter

1

2

3

4 5

6

“B” letter

Examples:

Page 25: Tangents- Definition Geometric Constructions A line is a tangent to a circle if it touches the circle at only one point

Geo

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Lettering : Upper Case & Numerals

Page 26: Tangents- Definition Geometric Constructions A line is a tangent to a circle if it touches the circle at only one point

Geo

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Geo

met

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ions Gothic vertical style.

Always use capital letters.

Text height 3~5 mm.

Space between lines of text is about of text height.

Lettering : Rules

Space between words equal to the space required for

writing a letter “O”.

Example:

ALL DIMENSIONS ARE INMILLIMETERS

O O OO UNLESS

OTHERWISE SPECIFIED.O

Page 27: Tangents- Definition Geometric Constructions A line is a tangent to a circle if it touches the circle at only one point

85

R100

R85

85

R100

R85

R70

R70

R70

R70

Tangents- CW 1G

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Page 28: Tangents- Definition Geometric Constructions A line is a tangent to a circle if it touches the circle at only one point

30200

140

80

Page 29: Tangents- Definition Geometric Constructions A line is a tangent to a circle if it touches the circle at only one point
Page 30: Tangents- Definition Geometric Constructions A line is a tangent to a circle if it touches the circle at only one point

R=44

R=18

R=16+19=35

R=16

R=8

R=22-5=17R=22

+5=2

7

R=19

R=18+22=40

R=44+22=66

R=19

R=19

Page 31: Tangents- Definition Geometric Constructions A line is a tangent to a circle if it touches the circle at only one point

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