#### Answer

A = MN * QO = base * altitude

#### Work Step by Step

Given MNPQ is a rhombus.
We need to find the area of the rhombus.
Draw an altitude from Q on base MN at O.
We know in Rhombus the opposite sides are parallel to each other so it acts as a parallelogram.
Using theorem 8.1.2 the area A of a parallelogram with a base of length b and corresponding altitude of length h is given by A=bh
therefore the area of rhombus = MN * QO
A = base * altitude.