Question

Area enclosed between two concentric circles is 770 cm2. if the radius of inner radius circle is 14 cm, then the radius of outer circle is:

Answer 1

Step-by-step explanation:

it may help you .........

Answer 2

Answer:

$let \: radius \: of \: inner \: circle \: be \: r \: cm$

$then$

$(\pi \times 14 \times 14) - \pi \: r {}^{2} = 770$

$\pi(196 - r {}^{2} ) = 770$

$\frac{22}{7} \times (196 - r {}^{2} ) = 77 0|$

answer is 21