8. दो वृत्तों के क्षेत्रफलो�

1.	8. दो वृत्तों के क्षेत्रफलों का अनुपात 4:1 है, तो उनकी त्रिज्याओं का अनुपात है-Areas of two circles are in the ratio 4: 1. then their radii are in the ratio of(B)2:1(A)4:1(C) 12(D)1:4
Answer» 2: 1 is the best answer 2:1 is the correct answer let radius of 1st circle =4xradius of 2nd circle=xarea of 1st circle : area of 2nd circleπ(4x)^2 : π(x)^216x^2 : x^216 : 1 sorry wrongly posted1st circle area/2nd circle area=4/1let radius are r1 and r2πr1^2/πr2^2=4/1r1/r2=√4/1 =2/1r1 : r2 = 2:1 it's b 2:1 is the correct answer

8. दो वृत्तों के क्षेत्रफलों का अनुपात 4:1 है, तो उनकी त्रिज्याओं का अनुपात है-Areas of two circles are in the ratio 4: 1. then their radii are in the ratio of(B)2:1(A)4:1(C) 12(D)1:4

Answer»

2: 1 is the best answer

2:1 is the correct answer

let radius of 1st circle =4xradius of 2nd circle=xarea of 1st circle : area of 2nd circleπ(4x)^2 : π(x)^216x^2 : x^216 : 1

sorry wrongly posted1st circle area/2nd circle area=4/1let radius are r1 and r2πr1^2/πr2^2=4/1r1/r2=√4/1 =2/1r1 : r2 = 2:1

it's b 2:1 is the correct answer