4. circumference= 31.4
radius= do not know
area= do not know
Can anyone help me solve how to do this
The circumference C = 2 pi r, where pi = 3.14 (approximately) and r is the radius. Then 31.4 = 2*3.14*r and the radius r = 31.4/(2*3.14) = 5. The area A = pi * r^2 = 3.14 * 25 = 78.5.
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