The 円周 of a circle is 14pi 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 14 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 : 49 π i n^{2}

十進法表記

153.93804 \dots

解答ステップ

Given:

c i rc u m f ere n ce : 14 π in

指定された円の半径

C i rc u m f ere n ce = 14 π : r = 7

指定された円の面積

r = 7 : A = 49 π

a re a : 49 π i n^{2}