The radius of the circle is 14 cm. Find the radius of the circle whose area is double of the area of the circle
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area of circle a= 22/7 *14* 14 =616 cm2
area of circle = 616*2=1232
therefore radius2 =1232*7/22=r2 = 392
r*r=392
therefore r = approx. 19.78
area of circle = 616*2=1232
therefore radius2 =1232*7/22=r2 = 392
r*r=392
therefore r = approx. 19.78
Vishnu73:
Radius of the given circle, r = 14 cmArea of the given circle, A = πr2 = 227×14×14 = 22 ×28 = 616 cm2Let r1 be the radius of the bigger circle.Area of bigger circle, A1 = πr12Now, A1 = 2A⇒πr12 = 2×616⇒227×r12 = 1232⇒r12 = 392⇒r1 = 7×7×2×2×2⇒r1 = 142 cm
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