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# 10.2 circles 2

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### 10.2 circles 2

1. 1. Daily Homework Quiz For use after Lesson 10.2 Find the area of the circle given its radius r. Use 3.14 for π. 1. r = 20 in. ANSWER A = π r2 A = 3.14 x 202 A= 1256 in.2If we were given area, how could wefind the radius?
2. 2. If the Area of the circle is 200.96 sq ft.Find the radius: A = π r2200.96 = 3.14 x r2 3.14 3.14 64 = r2 √64 = √ r2 8=r
3. 3. Given the Area- Find the RadiusSteps:1. Take the Area and divide by 3.14 - This is the radius squared.2. Take the square root. - You now have the radius of the circle.
4. 4. If the Area of the circle is 615.44 sq in.Find the radius: A = π r2615.44 = 3.14 x r2 3.14 3.14 196 = r2 √196 = √ r2 14 = r
5. 5. Find the area of the green shaded region 10 in 25 inRectangle: A= 10 x 25 = 250Circle: A = 3.14 x 25= 78.5 78.5 x 2 = 157The green area: 250 – 157 = 93
6. 6. 480.42m2
7. 7. HomeworkP. 529 #16-18, 33-34.ROUND TO THE NEAREST TENTH!!!!!! SHOW YOUR WORK!