the circumference of a circle is 31.4 .find the radius and the area of the circle ?
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circumference=2πr
31.4 = 2 × 3.14 × r
r = 31.4 × 1/2 × 1/3.14
r = 314 × 10/2 × 1/314 = 5
Area = πr^2 = 3.14 × 5 × 5 = 78.5
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Answercircumference of circle
=3.14=2×22/7×r
=3.14×7=2×22×r
=r=3.14×7/2×22
r=157×7/2200
r=1099/22×100
r=49.99/100
0.4999
Area of circle=22/7×0.4999^2
=22/7×0.24990001
=3.142×0.24990001
=0.7851858314
Step-by-step explanation:
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