gigi216 gigi216

23-05-2018
Mathematics

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what is the area of the inside surface of the ball to the nearest cm^2 ?

what is the area of the inside surface of the ball to the nearest cm2 class=

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altavistard altavistard

23-05-2018

The inside radius of the ball is (half of 22 cm) less 0.5 cm, or 11 cm less 0.5 cm, or 10.5 cm.

The area of the inside surface of the ball is thus

A = 4*pi*r^2, which here is

A = 4*pi*(10.5 cm)^2 = 1385.4 cm^2.

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