1. Warm Up
1. The table shows the costs for ordering different numbers of hair ribbons. What is the value of y if the cost is proportional to the number of hair ribbons ordered?
a.$ b.$ c.$ d.$67.50 2.

2. Volume 2 Page 620

4. Formula:
Substitute:
Solve:

5. Formula:
Substitute:
Solve:

6. Course 3
8-3
Circles
Find the area of each circle, both in terms of  and to the nearest tenth. Use 3.14 for .
A. Circle with a radius of 4 in.
A = r2
Formula__________
Substitute_________
Solve________
Answer__________
B. Circle with a diameter of 4 m
Formula__________
Substitute_________
Solve________
Answer__________

7. Your turn! Page 620: a & b

8. Area of semicircles and quart circles
Formulas:
Semicircle: 𝐴= 1 2 𝜋 𝑟 2
Quarter Circle: 𝐴= 1 4 𝜋 𝑟 2

9. Formula:
Substitute:
Solve:

10. Formula:
Substitute:
Solve:

11. Your turn! Page 621: c - d

12. Formula:
Substitute:
Solve: