two dimensional shapes power point
TRANSCRIPT
Amber Traverse
Two Dimensional Shapes3rd Grade South Carolina
Standards addressed
3-4.2 Classify polygons as either triangles, quadrilaterals, pentagons, hexagons, or octagons according to the number of their sides.
3-4.3 Classify lines and line segments as either parallel, perpendicular or intersecting
3-4.4 Classify angles as either right, acute, or obtuse
3-4.6 Exemplify points, lines, line segments, rays, and angles.
Amber Traverse
Do you know what each of these symbols represents?
Move to the next slide to learn the vocabulary that goes along with each of these symbols.
Amber Traverse
A Point• is an exact position
or location.
For example, in this picture each student has anexact position.
The boy in the orange shirt is third in the first row.
What is the exact position of the girl with orangeHair and pig tails?
http://school.discoveryeducation.com/clipart/clip/classhands.html
Amber Traverse
A Line Segment
• is straight
• is part of a line
• has two end points
For example, think about when we line up for recess. Each person is a point on the line.
Student A and student B make a line segment.That part of the line begins at A and ends at B.
A
B
C
D
E
F
G
Amber Traverse
A line• is straight
• continues in both directions
• does not end
Take the motion of a ball. You push the ball, if there was no gravity that ball would continue on the path for an undetermined amount of time.
Amber Traverse
A ray
• is straight
• is part of a line
• has one end point
• continues on in one without ending
A
Pretend that you are in space and throw a ball from point A. Because there is no gravity that ball will continue in the direction thrown.
Amber Traverse
Test your vocabulary knowledge
On your whiteboard/paper write the correct vocabulary word for each symbol.
1.
2.
3.
4.
Amber Traverse
Types of anglesAngles are made from two rays that share the
same end point (known as the vertex).
An acute angle• measures less than
90 degrees
A right angle• measures exactly 90 degrees• it makes a square where the two rays meet
An obtuse angle• measures greater than 80 degrees, but less than 180 degrees
Amber Traverse
Types of lines
Parallel lines are lines that never touch. An example of these lines would be the roads that we drive on.
Perpendicular lines are lines that cross over each other. Where the two lines meet right angles are formed. For example, where two roads meet ata light and cross over each other.
Intersecting lines areLines that cross over each other.Where the two lines meet acute andObtuse angles are formed.
Amber Traverse
Test your angle and line knowledge
Answer each number by naming the angle or line represented on your paper/whiteboard.
1.2.
3.
4.
5.
6.
Amber Traverse
Polygons are
• two dimensional figures that are closed
• contain straight sides (no curves)
• Contain the same number of angles as sides.
Amber Traverse
Quadrilaterals
Picture taken from: http://www.mathsisfun.com/quadrilaterals.html
• are four sided figures• have exactly four angles
Which of the following figures is not a quadrilateral?
Triangles
Amber Traverse
• are three sided figures
• have exactly three angles
• can be named either by their angles, sides, or both
Which of the followingis not a triangle?
Amber Traverse
Pentagons• are five sided
figures• have exactly
five angles
pentagon
Hexagons• Are six sided
figures• Have exactly
six angles
hexagon
Octagons• are eight
sided figures• Have exactly
eight angles
octagon
Amber Traverse
Polygon MasterpieceLook at the below picture made up of polygons; say the color then the name
of the polygon.
Amber Traverse
Works Cited Page
Pierce, Rod. "Quadrilaterals - Square, Rectangle, Rhombus, Trapezoid, Parallelogram" Math Is Fun. Ed. Rod Pierce. 25 May 2011. 3 Jul 2011 http://www.mathsisfun.com/quadrilaterals.html
ThinkCentral. Web. 02 July 2011. <https://www-k6.thinkcentral.com/ePC/viewResources.do?method=retrieveResources>.