1. Classify the triangle. A. scalene B. isosceles C. equilateral
5-Minute Check 1

2. Find x if mA = 10x + 15, mB = 8x – 18, and mC = 12x + 3.
5-Minute Check 2

3. 5-Minute Check 5-Minute Check 6
Find y if ΔDEF is an equilateral triangle and mF = 8y + 4.
A. 22 B
C. 7
D. 4.5
5-Minute Check 5-Minute Check 6

4. You used segment and angle bisectors.
Identify and use perpendicular bisectors in triangles.
Identify and use angle bisectors in triangles.
Then/Now

5. Concept

6. Use the Perpendicular Bisector Theorems
A. Find BC.
Example 1

7. Use the Perpendicular Bisector Theorems
B. Find XY.
Example 1

8. Use the Perpendicular Bisector Theorems
C. Find PQ.
Example 1

9. A. Find NO.
A. 4.6
B. 9.2
C. 18.4
D. 36.8
Example 1

10. B. Find TU.
A. 2
B. 4
C. 8
D. 16
Example 1

11. C. Find EH.
A. 8
B. 12
C. 16
D. 20
Example 1

12. Concept

13. Use the Angle Bisector Theorems
A. Find DB.
Example 3

14. Use the Angle Bisector Theorems
B. Find mWYZ.
Example 3

15. Use the Angle Bisector Theorems
C. Find QS.
Example 3

16. A. Find the measure of SR.
A. 22
B. 5.5
C. 11
D. 2.25
Example 3

17. B. Find the measure of UV.
A. 7
B. 14
C. 19
D. 25
Example 3

18. C. Find the measure of HFI.
B. 30
C. 15
D. 30
Example 3