Question

Maria is making a candle in the shape of a cylinder. She wants the candle to have a height of 3 cm and a radius of 2 cm. How much wax does Maria need?
12(pie) cm 3
12(pie) cm 2
18(pie) cm 3
20(pie) cm 2

Answer 1

V(cylinder) = πr²h

h=3 cm
r=2 cm

V(cylinder) = πr²h = π*2²*3 =12π cm³

Answer : 12π cm³.

Answer 2

Volume formula for cylinder
$\pi \: {r}^{2} h$
replace the letters with the correct number
$\pi \: {2}^{2} \times 3$
solve the exponent
${2}^{2} = 2 \times 2 = 4$
$\pi4 \times 3 = 12\pi$
Every time you are finding a volume for any 3d shape, you have to cube it.
$12\pi \: {cm}^{3}$