50 POINTS AND BRAINLIEST!!! QUICK
2 answers:
A)
R = outside radius
r = inside radius
equation: ( pi*R^2) - (pi*r^2)
B)
3.14 x 11^2 - 3.14 x 9^2
379.94 - 254.34 = 125.6 square meters
A = pi r^2 pi 9^2 81pi 81 * 3.14 = 254.34 pi 11^2 = 121pi 121 * 3.14 =379.94
379.94 - 254.34 = 125.60 area of sidewalk
Hope it helps
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