Answer:
Area = 147 cm^2.
Step-by-step explanation:
L the length = 3W where W is the width
Perimeter = 2L + 2W = 2(3W) + 2W
56 = 8W
W = 7 cm and the length = 3*7 = 21 cm.
Area = 7*21 = 147 cm^2.
