Question

The circumference of a circular swimming pool is 150 feet. If the radius of the pool is doubled, what will be its new circumference?

Answer 1

300 feet

Explanation:

IF you multiply the radius by 2, then all 2-dimensional measurements will be doubled too. Because circumference is 2d, the new circumference = 2*150 = 300

Answer 2

300 ft

Explanation:

C = 2 * pi *r

We double the radius

= 2 * pi *2r

We will double the circumference

= 2*pi*r * 2

150 will become 300