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>.