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8 votes
A circle is 16л cm². What is the circle's circumference? 2л cm 4л cm 8л cm 16л cm​

A circle is 16л cm². What is the circle's circumference? 2л cm 4л cm 8л cm 16л cm-example-1
User N West
by
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2 Answers

16 votes
16 votes

Answer:

Option 3

Explanation:


A=\pi r^2 = 16\pi \\ \\ r^2 =16 \\ \\ r=4 \\ \\ \implies C=2\pi r=2\pi (4)=8\pi

User Tim Nguyen
by
3.5k points
18 votes
18 votes

Answer:

8π cm

Explanation:

Hello!

Area of a Circle:
A = \pi r^2

Circumference of a Circle:
C = 2\pi r

We first have to find the radius, r.

Find R


  • A = \pi r^2\\A = 16\pi^

  • \pi r^2 = 16\pi

  • r^2 = 16

  • r = 4
    \hookrightarrow Take positive value

Now, we can find the circumference, given the radius.

Find the Circumference


  • C = 2\pi r

  • C = 2\pi (4)

  • C = 8\pi

The circumference is 8π cm.

User Koba
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2.9k points