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.

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Presentation transcript:

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.$4.50 b.$22.50 c.$45.00 d.$67.50 2.

Volume 2 Page 620

Formula: Substitute: Solve:

Formula: Substitute: Solve:

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__________

Your turn! Page 620: a & b

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

Formula: Substitute: Solve:

Formula: Substitute: Solve:

Your turn! Page 621: c - d

Formula: Substitute: Solve: