Answer:
169π or 530.93
Step-by-step explanation:
The formula for the area of a circle is πr²
Here, the radius is given to be 13.
So, let's just plug it into the formula as r
π x 13²
π x 169
169π
The radius is 169π. If you want to multiply out the π you would get 530.93, which is equivalent of course.
Answer:
Step-by-step explanation:
one solution
Step-by-step explanation:
volume = crossectional area×height
55×21= 1155cm³
Step-by-step explanation:
Louise calculated the height of a cylinder that has a volume of 486 pi cubic centimetres and a radius of 9 centimetres.
The formula for the volume of cylinder is :
V = B × h
B is area of base of cylinder

i.e.

Substituting given values,

will cancel out from both sides.

She forgets to cancel down
from both sides. So, she get height as
. So, in the
should have canceled, making the correct answer 6 cm.