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# 10.4 - Area of a Circle

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Middle School Math Book 1 - Chapter 10.4 - Area of a Circle - Power Point made from a SmartNotebook file. Some of the formatting is off.
http://gesdmath.wikispaces.com

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### 10.4 - Area of a Circle

1. 1. 10.4 - Area of a Circle Joseph Williams Melvin E. Sine Elementary [email_address] Objective: Find the area of a circle.
2. 2. Vocabulary pi - - pg. 485 - the ration of the circumference of a circle to its diameter. ( 3.14 ) Area - pg. 62 - the amount of space covered by a figure. Area is measured in squared units. Radius - pg. 485 - The distance from the center of a circle to any point on the circle.
3. 3. Area of a Circle Area = (pi)(radius)^2 A = r^2 A = (3.14)r^2 3 cm A = (3.14)3^2 A = 3.14 9 A = 28.26 cm squared
4. 4. Find the area of the key and half circle above the free throw line. 12 ft. 19 ft. 6 ft
5. 5. Area of the key A = bh A = 19 12 = 228 ft^2 Area of the half circle A = r^2 A = 3.14 6^2 = 3.14 36 = 113.04 ft^2 We only need the area for half the circle ! 113.04 / 2 = 56.52 ft^2 Now we need to add them. 228 + 56.52 = 284.52 ft^2