If the perimeter of a circle is increased by 30 what will be the effect on the area of the circle

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Concept:

Area of rectangle = Length × Breadth

Perimeter of rectangle = 2 × (Length + Breadth)

Given: 

Let be assume a is length of rectangle and b is breadth of rectangle

According to question

⇒ 2 × (1.3a + b) = 191

⇒ 1.3a + b = 95.5      ---(1)

⇒ 2 × (a + 1.25b) = 170

⇒ a + 1.25b = 85      ---(2)

from  (1) and (2)

a = 55, b = 24

Now, 

Area of rectangle = Length × Breadth

⇒ a × b

⇒ 55 × 24 = 1320m2

∴ Thearea of re​ctangle is 1320m2.

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Perimeter of rectangle = 2*(A+B) Area = AB Total increment in area = (30+30+(30*30)/100) = 69%

Area will be increased by 69%