1. Splash Screen

2. Use the number line to find the measure of AC.
5-Minute Check 1

3. Use the number line to find the measure of DE.
C. 7
D. 9
5-Minute Check 2

4. Use the number line to find the midpoint of EG.
A. D
B. E
C. F
D. H
5-Minute Check 3

5. Find the distance between P(–2, 5) and Q(4, –3).
5-Minute Check 4

6. Find the coordinates of R if M(–4, 5) is the midpoint of RS and S has coordinates (0, –10).
B. (–4, 15)
C. (–2, –5)
D. (2, 20)
5-Minute Check 5

7. A boat located at (4, 1) can dock at two locations
A boat located at (4, 1) can dock at two locations. Location A is at (–2, 9) and Location B is at (9, –11). Which location is closest? How many units away is the closest dock?
A. Location A, 10 units
B. Location A, 12.5 units
C. Location B, 10 units
D. Location B, 12.5 units
5-Minute Check 6

8. Mathematical Practices 5 Use appropriate tools strategically.
Content Standards
G.CO.1 Know precise definitions of angle, circle, perpendicular line, parallel line, and line segment, based on the undefined notions of point, line, distance along a line, and distance around a circular arc.
G.CO.12 Make formal geometric constructions with a variety of tools and methods (compass and straightedge, string, reflective devices, paper folding, dynamic geometric software, etc.).
Mathematical Practices
5 Use appropriate tools strategically.
6 Attend to precision.
CCSS

9. You measured line segments.
Measure and classify angles.
Identify and use congruent angles and the bisector of an angle.
Then/Now

10. ray degree right angle acute angle opposite rays angle obtuse angle
angle bisector
opposite rays
angle
side
vertex
interior
exterior
Vocabulary

11. A. Name all angles that have B as a vertex.
Angles and Their Parts
A. Name all angles that have B as a vertex.
Answer:
Example 1

12. Angles and Their Parts
B. Name the sides of 5.
Answer:
Example 1

13. Angles and Their Parts C.
Example 1

14. A. A. B. C. D.
Example 1a

15. B. A. B. C.
D. none of these
Example 1b

16. Which of the following is another name for 3?B. C. D.
Example 1c

17. Concept

18. A. Measure TYV and classify it as right, acute, or obtuse.
Measure and Classify Angles
A. Measure TYV and classify it as right, acute, or obtuse.
Answer: mTYV = 90, so TYV is a right angle.
Example 2

19. Answer: 180 > mWYT > 90, so WYT is an obtuse angle.
Measure and Classify Angles
Answer: 180 > mWYT > 90, so WYT is an obtuse angle.
Example 2

20. Measure and Classify Angles
Example 2

21. A. Measure CZD and classify it as right, acute, or obtuse.
A. 30°, acute
B. 30°, obtuse
C. 150°, acute
D. 150°, obtuse
Example 2a

22. B. Measure CZE and classify it as right, acute, or obtuse.
A. 60°, acute
B. 90°, acute
C. 90°, right
D. 90°, obtuse
Example 2b

23. C. Measure DZX and classify it as right, acute, or obtuse.
A. 30°, acute
B. 30°, obtuse
C. 150°, acute
D. 150°, obtuse
Example 2c

24. Measure and Classify Angles
INTERIOR DESIGN Wall stickers of standard shapes are often used to provide a stimulating environment for a young child’s room. A five-pointed star sticker is shown with vertices labeled. Find mGBH and mHCI if GBH  HCI, mGBH = 2x + 5, and mHCI = 3x – 10.
Example 3

25. mGBH = mHCI Definition of congruent angles
Measure and Classify Angles
Step 1 Solve for x.
GBH  HCI Given
mGBH = mHCI Definition of congruent angles
2x + 5 = 3x – 10 Substitution
2x + 15 = 3x Add 10 to each side.
15 = x Subtract 2x from each side.
Example 3

26. Step 2 Use the value of x to find the measure of either angle.
Measure and Classify Angles
Step 2 Use the value of x to find the measure of either angle. .
Answer: mGBH = 35, mHCI = 35
Example 3

27. Find mBHC and mDJE if BHC  DJE, mBHC = 4x + 5, and mDJE = 3x + 30.
A. mBHC = 105, mDJE = 105
B. mBHC = 35, mDJE = 35
C. mBHC = 35, mDJE = 105
D. mBHC = 105, mDJE = 35
Example 3

28. End of the Lesson