Sample Problem

ABCD is a parallelogram. When AB is the base, AE is the height. When BC is the base, CF is the height. How long is CF?

The length of CF is  cm.


Area of parallelogram ABCD

 = 12cm × 10 cm

 = 120 cm2

The length of BC

 = 15 cm

The length of CF

 = 120 cm2 ÷ 15 cm

 = 8 cm