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Phổ biến Word Problems >

The chu vi of a circle is 18pi ft. What is the area, in square feet? Express your answer in terms of pipi.

Lời Giải

T h e c i rc u m f ere n ce o f a c i rc l e i s 18 π f t . Wha t i s t h e a re a, in s q u a re f ee t ? E x p ress yo u r an s w er in t er m s o f p iπ .

Lời Giải

a re a : 81 π f t^{2}

+1

Số thập phân

254.46900 \dots

Các bước giải pháp

Given:

c i rc u m f ere n ce : 18 π f t

Bán kính đường tròn đã cho

C i rc u m f ere n ce = 18 π : r = 9

Diện tích hình tròn đã cho

r = 9 : A = 81 π

a re a : 81 π f t^{2}

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