Question

Area is 286cm^2 .Radius of outer xircle is 10cm find the radius of inner circle
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Answer 1

Step-by-step explanation:

let radius of iner cricle r

radius of outer circle R= 10cm

area = π R² - π r²

= π( 10²-r²)

then

π(10²-r²)= 286

or 22/7 (100-r²)= 286

or (100-r²) = 286 ×7/22

or 100-r2= 13×7

or -r²= 91-100

or r²= 9

or r = 3cm

radius of inner circle 3cm