Question

### Gauthmathier1046

Grade 9 · 2020-11-04

Let A denote the area of a circular region. Which of the following denotes the circumference of that circular region? （ ）

Good Question (55)

Answer

4.7(252) votes

### Gauthmathier2982

Grade 9 · 2020-11-04

Answer

E

Explanation

Since A denotes the area of the circular region, we get

A= \pi r^{2}

\dfrac{A}{ \pi }=r^{2}

\sqrt{\dfrac{A}{ \pi }}=r

Hence, the circumference is C=2 \pi r=2 \pi \sqrt{\dfrac{A}{ \pi }}

The answer is (E).

A= \pi r^{2}

\dfrac{A}{ \pi }=r^{2}

\sqrt{\dfrac{A}{ \pi }}=r

Hence, the circumference is C=2 \pi r=2 \pi \sqrt{\dfrac{A}{ \pi }}

The answer is (E).

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