The area of a circle of radius r is 10 sq.cm. then the area of a circle of radius 2r is sq.cm.
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area of circle=10
⇒2πr²=10
⇒44/7×r²=10
⇒r²=70/44
⇒r=√(70/44)
⇒r=√70/(2√11)
R=2r=√70/√11
area of circle=πR²=(22/7)×(70/11)=20 cm²
⇒2πr²=10
⇒44/7×r²=10
⇒r²=70/44
⇒r=√(70/44)
⇒r=√70/(2√11)
R=2r=√70/√11
area of circle=πR²=(22/7)×(70/11)=20 cm²
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