Question

The perimeter of a rectangle is 3 times its length. If its
length is 20 cm, find its area.
​

Answer 1

Answer:800cm square

pls refer my attachment:

Answer 2

Step-by-step explanation:

peremeter = (20×3)

= 60

peremeter = 2(l+b)

l=2x

b= x

60= 2(2x+x)

60= 2(3x)

60= 6x

x= 60/6

x= 10

l = 2× 10 = 20

b = 10

Area = l × b

= 20× 10

= 200 cm