(10) 4203/(Set : B)21. वृत्त का क्षेत्रफ

1.	(10) 4203/(Set : B)21. वृत्त का क्षेत्रफल क्या है, जिसकी परिधि, 11 cm भुजा के एक वर्गके परिमाप के बराबर है ?।What is area of circle, the circumference ofwhich is equal to the perimeter of a square ofside 11 cm?
Answer» Given,Side of Square = 11 cm Perimeter of Square Ps= 4side= 411 = 44 cm Let radius of circle be r Then,Circumference of circle C = 2pir As per given conditionC = Ps2pir = 44222/7r = 44r = 7 cmm Area of circle = pirr= 22/7 * 7 *7= 154 cm^2

(10) 4203/(Set : B)21. वृत्त का क्षेत्रफल क्या है, जिसकी परिधि, 11 cm भुजा के एक वर्गके परिमाप के बराबर है ?।What is area of circle, the circumference ofwhich is equal to the perimeter of a square ofside 11 cm?

Answer»

Given,Side of Square = 11 cm

Perimeter of Square Ps= 4*side= 4*11 = 44 cm

Let radius of circle be r

Then,Circumference of circle C = 2*pi*r

As per given conditionC = Ps2*pi*r = 442*22/7*r = 44r = 7 cmm

Area of circle = pi*r*r= 22/7 * 7 *7= 154 cm^2