Math, asked by zaheer136, 1 year ago

in the adjoining figure, the area enclosed between the concentric circles is 770cm square . if the radius of the circle is 21cm ,calculate the radius of inner circle

Answers

Answered by A2Z123456

9

Answer:

Step-by-step explanation:

Area = \pi (R²-r²)

770 = 22/7 × [(21)² - r²]

770×7÷22 = 441-r²

441 - 245 = r²

r² = 196

r = √196

r = 14cm

Answered by hemantmishragpk

3

Answer:

Step-by-step explanation:

formula,,,, π[R sq - r sq] = 770

22/7(441-

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