Find the volume of a right circular cone that has a height of 15 m and a base with a circumference of 18.5 m. round your answer to the nearest tenth of a cubic meter.

I hate the rounding. Why ruin a nice exact answer with an approximation?

I like doing the general solution first and plugging in the numbers last.

The usual formula for the volume of a cone is

We're given circumference

so

Substituting,

ca = ec

cpctc makes it so that corresponding parts of the triangle you proved to be equal are equal, the other options aren't part of the part of the triangles you proved to be equal.