1. LESSON 10–3
Arcs and Chords

2. Concept

3. A. 42.5
B. 85 C
D. 170
Example 1

4. Use Congruent Chords to Find Arc Measure
Jewelry A circular piece of jade is hung from a chain by two wires around the stone. JM  KL and = 90. Find
Example 1

5. Use Congruent Arcs to Find Chord Lengths
Example 2

6. A. 6
B. 8
C. 9
D. 13
Example 2

7. Concept

8. Use a Radius Perpendicular to a Chord
Answer:
Example 3

9. A. 14
B. 80
C. 160
D. 180
Example 3

10. In the circle below, diameter QS is 14 inches long and chord RT is 10 inches long. Find VU.
Example 4

11. Use a Diameter Perpendicular to a Chord
CERAMIC TILE In the ceramic stepping stone below, diameter AB is 18 inches long and chord EF is 8 inches long. Find CD.
Example 4

12. Concept

13. Chords Equidistant from Center
Since chords EF and GH are congruent, they are equidistant from P. So, PQ = PR.
Example 5

14. A. 7
B. 10
C. 13
D. 15
Example 5