Question

pls solve this question​

Answer 1

Step-by-step explanation:

Here,

Length of rectangle (l)=10cm

breadth of rectangle (b)=8cm

Thus,

Perimeter of rectangle=2(l+b)

=2(10+8)

=2(18)

=36cm

Let's say,

The length and breath is incresed by y cm.

Thus, Length of rectangle=10+y cm

Breadth of rectangle=8+y cm

Now,

According to the condition,

When all sides are increased by y cm, the

Perimeter is 2 times the perimeter of earlier triangle (36 cm)

Thus,

Perimeter of rectangle=2(l+b)

36×2=2[(10+y)+(8+y)]

72=20+2y+16+2y

72=36+4y

72 - 36=4y

36=4y

36/4=y

9 cm=y

Now, the area of new rectangle is

A=l×b

A=(10+y)(8+y)

=(10+9)(8+9)

=(19)(17)

=323sq.cm

Thank you