A circle with radius of 9cm sits inside a circle with radius of 11cm
What is the area of the shaded region?
Answers
Answer:area of circle having radius 11cm
Area=pie×r^2
So 22/7×11×11
1.57×22×11
388.94cm^2 take as A1
Now area of circle having radius 9cm
22/7×9×9
1.28×22×9
253.44 cm^2take asA2
Now to find area of shaded region
A1-A2
388.94-253.44
=135.50cm^2
Step-by-step explanation:
Answer:
let the radius of bigger circle be 'R' = 11 cm
area of bigger circle = πR²
similarly,
let the radius of smaller circle be 'r'=9 cm
area of the smaller circle = πr²
=> Area of the shaded region = πR² - πr²
= π(R² - r²)
= π(R+r)(R-r)..............[using eq. (a²-b²)=(a+b)(a-b)]
= π(11+9)(11-9).............putting given values
= 22/7 x 20 x 2
= 125.6 cm²