zs

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

受欢迎的 Word Problems >

The area of a circle is 81𝜋 square feet. What is the 周长?

解答

T h e a re a o f a c i rc l e i s 81​𝜋 s q u a re f ee t . Wha t i s t h e c i rc u m f ere n ce ?

解答

c i rc u m f ere n ce : 18 π f t

+1

十进制

56.54866 \dots

求解步骤

Given:

a re a : 81 π f t^{2}

给定

A re a = 81 π

的圆半径:

r = 9

给定

r = 9

的圆周长:

C = 18 π

c i rc u m f ere n ce : 18 π f t

流行的例子

The area of a circle is 0.0314 square miles. What is the circle's 半径 The 周长 of a circle is 8𝜋 kilometers. What is the area?A circle has a 半径 of 10.5 centimeters. What is the area of the circle? Use 3.14 for pi 90 is 20% of what number You want to have 800,000 when you retire in 30 years. If you can earn 7% interest compounded continuously, how much would you need to deposit now into the account to reach your retirement goal?