The 円周 of a circle is 25pi in. What is the area, in square inches? Express your answer in terms of pipi.

解

T h e c i rc u m f ere n ce o f a c i rc l e i s 25 π in . Wha t i s t h e a re a, in s q u a re in c h es ? E x p ress yo u r an s w er in t er m s o f p iπ .

a re a : 490.87 i n^{2}

解答ステップ

Given:

c i rc u m f ere n ce : 25 π in

指定された円の半径

C i rc u m f ere n ce = 25 π : r = 12.5

指定された円の面積

r = 12.5 : A = 490.87385 \dots

a re a : 490.87 i n^{2}