warm up elena used a rectangle, a square, a kite, a rhombus, and an isosceles trapezoid as part of...

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Warm Up Elena used a rectangle, a square, a kite, a rhombus, and an isosceles trapezoid as part of a computer game she was creating. The player selects two of these shapes at random. If each of the selected shapes has at least one pair of opposite sides parallel, the player can use these shapes as keys to a higher level of the game. What is the probability of selecting a pair of keys? Represent each shape with a letter

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Page 1: Warm Up  Elena used a rectangle, a square, a kite, a rhombus, and an isosceles trapezoid as part of a computer game she was creating. The player selects

Warm Up Elena used a rectangle, a square, a kite, a rhombus,

and an isosceles trapezoid as part of a computer game she was creating. The player selects two of these shapes at random. If each of the selected shapes has at least one pair of opposite sides parallel, the player can use these shapes as keys to a higher level of the game. What is the probability of selecting a pair of keys?

Represent each shape with a letter

Page 2: Warm Up  Elena used a rectangle, a square, a kite, a rhombus, and an isosceles trapezoid as part of a computer game she was creating. The player selects

Given:

AD is parallel to BC

m< D = 8x + 20

m<A = 150 – 6x

m<C = 12x + 60

Find x

Find m<B

Is AB parallel to DC?

A

C

B

D

<A and <D are supplementary

150 - 6x + 8x +20 = 180

x = 5

m<D = 60

m<A = 120

m<C = 120

Since <D is supplementary to <A, AB is parallel to DC.

Page 3: Warm Up  Elena used a rectangle, a square, a kite, a rhombus, and an isosceles trapezoid as part of a computer game she was creating. The player selects

5.5 Properties of Quadrilaterals

Objective: identify properties of quadrilaterals

Page 4: Warm Up  Elena used a rectangle, a square, a kite, a rhombus, and an isosceles trapezoid as part of a computer game she was creating. The player selects

Properties of parallelograms Opposite sides are parallel and congruent Opposite angles are congruent Diagonals bisect each other Any pair of consecutive angles are

supplementary

Page 5: Warm Up  Elena used a rectangle, a square, a kite, a rhombus, and an isosceles trapezoid as part of a computer game she was creating. The player selects

Properties of rectangles: All properties of parallelograms apply All angles are right angles Diagonals are congruent

Page 6: Warm Up  Elena used a rectangle, a square, a kite, a rhombus, and an isosceles trapezoid as part of a computer game she was creating. The player selects

Properties of a kite: Two disjoint pairs of consecutive sides are congruent Diagonals are perpendicular One diagonal is the perpendicular bisector of the

other One diagonal bisects a pair of opposite angles (wy

bisects <xwz and <xyz) One pair of opposite angles are congruent (<wxy and

<wzy)

yW

x

z

Page 7: Warm Up  Elena used a rectangle, a square, a kite, a rhombus, and an isosceles trapezoid as part of a computer game she was creating. The player selects

Properties of a rhombus: All properties of parallelograms apply All properties of a kite apply All sides are congruent (equilateral) Diagonals bisect the angles Diagonals are perpendicular bisectors of each

other Diagonals divide it into four congruent right

triangles.

Page 8: Warm Up  Elena used a rectangle, a square, a kite, a rhombus, and an isosceles trapezoid as part of a computer game she was creating. The player selects

Properties of a square: All properties of a rectangle All properties of a rhombus The diagonals form four isosceles triangles

(45-45-90)

Page 9: Warm Up  Elena used a rectangle, a square, a kite, a rhombus, and an isosceles trapezoid as part of a computer game she was creating. The player selects

Properties of an isosceles trapezoid:

Legs are congruent (definition) Bases are parallel (definition) Lower base angles are congruent Upper base angles are congruent Diagonals are congruent Lower base angle is supplementary to upper

base angle

Page 10: Warm Up  Elena used a rectangle, a square, a kite, a rhombus, and an isosceles trapezoid as part of a computer game she was creating. The player selects

Given: ZRVA is a parallelogram

AV = 2x – 4

RZ = ½ x + 8

VR = 3y + 5

ZA = y + 12

Find x

Find y

Find the perimeter

RV

A Z

Page 11: Warm Up  Elena used a rectangle, a square, a kite, a rhombus, and an isosceles trapezoid as part of a computer game she was creating. The player selects

R

P

S

M O

Given: Rectangle MPRS

MO congruent to PO

Prove: ΔROS is isosceles

http://www.mathwarehouse.com/geometry/quadrilaterals/parallelograms/