10.2 circles 2
Transcript of 10.2 circles 2
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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 = r2
A = 3.14 x 202
A= 1256 in.2
If we were given area, how could we find the radius?
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If the Area of the circle is 200.96 sq ft.
Find the radius: A = r2 200.96 = 3.14 x r2
3.14 3.14 64 = r2
√64 = √ r2
8 = r
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Given the Area- Find the Radius
Steps: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.
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If the Area of the circle is 615.44 sq in.
Find the radius: A = r2 615.44 = 3.14 x r2
3.14 3.14 196 = r2
√196 = √ r2
14 = r
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Find the area of the green shaded region
10 in
25 in
Rectangle: A= 10 x 25 = 250
Circle: A = 3.14 x 25= 78.5
78.5 x 2 = 157
The green area: 250 – 157 = 93
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480.42m2
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Homework
P. 529 #16-18, 33-34.
ROUND TO THE NEAREST TENTH!!!!!!
SHOW YOUR WORK!