Question

the perimeter of a rectangle is 70 cm. if the length of the rectangle is 30 cm, find the area​

Answer 1

Answer:

perimeter of rectangle=70cm

length=30cm

perimeter=2(l+b)

2(30+b)=70

60+2b =70

2b=10

b=10/2

breadth=5cm

area=l×b

=30×5

150cmsq

Answer 2

Answer:

$150cm^2$

Step-by-step explanation:

Given:

Length of the rectangle $(l)$ = 30 cm

Perimeter of the rectangle = 70 cm

To find:

The area of the rectangle

Solution:

Perimeter of the rectangle = $2(l+b)$

$70=2(30+b)$

$70=60+2b$

$70-60=2b$

$2b=10$

$b=\frac{10}{2}$

$b=5cm$

∴The width of the rectangle is 5 cm.

Area of the rectangle = $l\times b$ sq. units

⇒ $30\times 5$

⇒ $150cm^2$

∴ The area of the rectangle = $150cm^2$