Question

The perimeter of an irregular shape with 4

sides is 21 centimeters. Three of the side
lengths are 4 centimeters, 2 centimeters, and
6 centimeters. What is the length of the
unknown side?

HELPP

Answer 1

9

Explanation:

Three sides are

• 4cm
• 2cm
• 6cm

Let other side be x

`\rm \mapsto \: x + 4 + 2 + 6 = 21 \\ \rm \mapsto \: x + 6 + 6 = 21 \\ \rm \mapsto \: x + 12 = 21 \\ \rm \mapsto \: x = 21 - 12 \\ \rm \mapsto \: x = 9`