1. TODAY IN GEOMETRY…  STATs on Ch. 3 Test  Learning Target: 4.1 Classify Triangles and find measures of their angles  Independent Practice

2. HOW DID YOU “SHAPE” UP?? Results for ALL of my Geometry classes: GRADE NUMBER OF STUDENTS WHO TOOK THE CH.9 TEST (36 pts.) 1 ST PERIOD3 RD PERIOD5 TH PERIOD6 TH PERIODTOTAL A1522152375 B323210 C434213 D11103 F22116 Avg.31.2832.5732.4633.9832.57

3. CLASSIFYING TRIANGLES BY SIDES AND ANGLES

4. CLASSIFYING TRIANGLES BY SIDES: TRIANGLE # of congruent sides example SCALENE ISOSCELES EQUILATERAL 0 2 3

5. REVIEW ANGLE VOCABULARY:

6. CLASSIFYING TRIANGLES BY ANGLES: TRIANGLE Type of Angle example ACUTE RIGHT OBTUSE EQUIANGULAR 3 acute angles 1 right angle 1 obtuse angle 3 congruent angles

7. B A C 1. Use the distance formula to find the length of each side. 2. Calculate slope to determine right angles.

8. B(-1, 2) A(0, 0) C(6, 3) None of the sides of the triangle have the same length so this triangle is SCALENE.

9. B(-1, 2) A(0, 0) C(6, 3)

10. INTERIOR VS EXTERIOR ANGLES

11. 1 2 3 4 5 6 7 8 9 Extend sides of a polygon to find exterior angles. Interior angles are found inside the polygon.

12. TRIANGLE SUM THEOREM: ADDING ALL THE INSIDE ANGLES

13. 1 3 2

14. Find x.

15. EXTERIOR ANGLE THEOREM: MEASURE OF THE OUTSIDE IS TWO OF THE INSIDE

16. EXTERIOR ANGLE THEOREM: The measure of an exterior angle of a triangle is equal to the sum of the measures of the two remote interior angles. 1 3 2 4

17. Find x and y.

18. Find x.

19. Find x and y.

20. HOMEWORK #1: Pg. 221: 1-26, 32, 35-37