This figure shows the dimensions of a right triangular prism. What is the volume of the right triangular prism in cubic meters?​

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.

the answer is c: divide the arc's degree measure by 360°, then multiply by the circumference of the circle.