Two angles are supplementary the first angle measures 30 what’s the measurement of the second angle?

Prove that quadrilateral is a rhombus.

The lengths of all sides of a triangle are integers when measured in decimeters. one of the sides has length of 1 dm and another of 3 dm. find the perimeter of the triangle.'

What effect would doubling all the dimensions of a triangular pyramid have on the volume of the pyramid? explain your reasoning.