Question

$ABCD$ is a parallelogram whose height $DE$ is $4$ cm and base $AB$ is $10$ cm. If the height $AF$ on $BC$ is $5$ cm, find the width $BC$.

Answer 1

Area of the parallelogram will not change even if we change the base and the height.

$4\ast 10=5\ast BC$

$BC=8cm$