Question

Help i didn't understand this lesson :((​

Answer 1

Answer:

Circumference =

$20\pi \: cm$

Step-by-step explanation:

Area of circle =

$\pi \: r \: {}^{2}$

so, according to question :

=》

$\pi {r}^{2} = 100\pi$

=》

${r}^{2} = 100$

=》

$r = \sqrt{100}$

=》

$r = 10$

so, radius = 10 cm.

now :

Circumference =

$2\pi r$

=》

$2 \times \pi \times 10$

=》

$20\pi$

Answer 2

Answer:

20π

hope it helps

thanks for giving such a easy question