Question

Find the radius of the bigger circle if the area of a ring is 164π cm² and the area of the smaller circle is 61π cm²

Answer 1

Answer:

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Answer 2

Answer:

15cm

Step-by-step explanation:

area of ring=164π cm²

area of smaller circle= 61π cm²

let area of bigger cicle be x

area of ring=area of bigger circle-area of smaller circle

164π =x-61π

164π +61π =x

225 π=x

area of bigger circle:

area of circle=π r²

π r²=225 π

r²=225

r=$\sqrt{225$

r=15

therefore the radius of bigger circle is 15cm