Question

what is the perimeter of the shape? 3 cm 7 cm 8 cm 12 cm 12 cm 8 cm 7 cm 3 cm centimeters

Explanation:

Step1: Recall perimeter concept

Perimeter is sum of all side - lengths.

Step2: Add all side - lengths

$3 + 7+8 + 12+8 + 7+3 + 12$
$=(3 + 7)+8 + 12+8 + 7+3 + 12$
$=10+8 + 12+8 + 7+3 + 12$
$=(10 + 8)+12+8 + 7+3 + 12$
$=18+12+8 + 7+3 + 12$
$=(18 + 12)+8 + 7+3 + 12$
$=30+8 + 7+3 + 12$
$=(30 + 8)+7+3 + 12$
$=38+7+3 + 12$
$=(38 + 7)+3 + 12$
$=45+3 + 12$
$=(45 + 3)+12$
$=48+12$
$=60$

Answer:

$60$