Question

1. The circumference of a circular pond is 88m. Find its radius.​

Answer 1

Answer:

Using 22/7 for π, the diameter of the pond is 88/(22/7) more easily expressed as 7x88/22, or 28 metres. the area is πd²/4, or πr², whichever you find easier…so-

πd²/4 = 22/7 x 28 x 28/4, which simplifies to 22 x 4 x 7

πr² = 22/7 x 14 x 14 , simplifying to 22 x 2 x 14

Both arrive at the same answer, and it’s even simpler if you know that the area of a circle is 22/28 of the diameter² 22/28 x 28 x 28, or 22 x 28

Answer 2

${\tt{\underline{Given:-}}}$

The circumference of a circular pond is 88m

${\tt{\underline{Need\;to\;find:-}}}$

The Radius of the pond

${\tt{\underline{Answer:-}}}$

We've to first assume the radius of the pond as a variable. Let's say the radius is r metres

$\boxed{\tt Circumference = 2\pi r}$

=> 88 = 2 × 22/7 × r

=> 88 × 1/2 = 22/7 × r

=> 44 = 22/7 × r

=> 44 × 7/22 = r

=> 2 × 7 = r

=> 14 = r