1. I can identify and select appropriate unites to measure angle.
2.6
I can identify and select appropriate unites to measure angle.

2. 3.4 and 3.5
“I can describe and use properties of congruent figures to solve problems.”
“ I can use physical models to determine the sum of the interior angles of triangles and quadrilaterals.”

3. Why do I need to know this?
How many items have corners or angles?
Triangles and Quadrilaterals in real life?
Puzzles
Placing two items into a corner.
Cutting Wood

4. Vocabulary
Degrees - tells you the amount of space between two rays of an _________.
The greater the distance between rays, the greater the number of degrees of the angle.
The length of the rays does ________ __________ the measure of the angle.

5. Degrees of Angles What does the degree symbol look like?

6. Congruent Figures
Congruent Figures - figures that have the same ________ and _________.
Look at angles and sides to determine if they are congruent.
5 m C
5 m F I A
2 m
2 m
120
120 E
4 m J
4 m
2 m
2 m B D G H
5 m
5 m

7. Triangle
Triangle - a 3 sided figure with all angles adding up to _______ degrees.
Rules:
______ up the two angles that you have.
Subtract the sum of the two angles from ________. 45 90 X
A B C. 25

8. Triangles Activity with Angles Find the missing angle: 60 X X 60 14015
A B C. 45
A B C. 15

9. Quadrilateral Quadrilateral - is a _____ sided polygon.
ALL sides ADD up to ______ degrees. 90 90 80
100 90 80
100 90
360 degrees
360 degrees

10. Rules for Quadrilaterals
Add up the angles.
Subtract the _______ of the angles from _________ .
110 X 70
110
A B C. 70

11. Find the missing angle. Quad = 4 95 X 85 95 A. 85 B. 95 C. 75 90 90 90
360 degrees
A B C. 89

12. What did we learn today? Angles Congruent Figures Triangles
Quadrilaterals