For The triangle shown match additional congruency statement is needed to prove angle ABC = angle DEF

This is so hard and it’s for a test

Acomposition of transformations maps δxyz to δx"y"z". the first transformation for this composition is , and the second transformation is a 90° rotation about point x'.

The volume of the a sphere whoes diameter is 18 cm is cubic cm . if it's diameter were reduced by half, it's volume would be of its original volume