Question

A cylinder has a radius of 30 ft and a height of 19 ft. What is the exact surface area of the cylinder?

Answer 1

$SA=2(pi)rh+2(pi)r^2$

$SA=2(pi)(30)(19)+2(pi)(30^2)$

$SA=2(pi)(30)(19)+2(pi)(900)$

$SA=3581.3+5654.7$

$SA=9236$

9236 square feet

Answer 2

$A=2\pi r(r+h)\\ A=2\pi\cdot30\cdot(30+19)\\ A=60\pi\cdot49\\ A=2940\pi\hbox{ ft}^2$