Calculate the Missing Side in a Trapezoid with 25cm Perimeter

Question

The perimeter of the trapezoid in the diagram is 25 cm. Calculate the missing side.

00:00 Find side BC

00:03 The perimeter of the trapezoid equals the sum of its sides

00:15 Let's substitute appropriate values and solve for BC

00:38 Let's isolate BC

00:48 And this is the solution to the question

We replace the data in the formula to find the perimeter:

$25=4+7+11+x$

$25=22+x$

$25-22=x$

$3=x$

$3$ cm