Question

Find the volume of a sphere, to the nearest tenth, that has a radius of 7cm

Answer 1

The formula of a volume of a sphere with radius R:

$V=\dfrac{4}{3}\pi R^3$

We have R = 7cm. Substitute:

$V=\dfrac{4}{3}\pi\cdot7^3=\dfrac{4}{3}\pi\cdot343=\dfrac{1372\pi}{3}\ cm^3$

$\dfrac{1372\pi}{3}\approx1436.0\ cm^3$

Answer: V = 1436.0 cm³