RD Sharma - Mathematics

Book: RD Sharma - Mathematics

Chapter: 21. Surface Area and Volume of a Sphere

Subject: Mathematics - Class 9th

Q. No. 7 of CCE - Formative Assessment

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7

If the ratio of volumes of two spheres is 1: 8, then the ratio of their surface areas is

Ratio of volume of spheres = (ratio of radius)3


Given, ratio of volumes of two spheres is 1: 8


(ratio of radius)3 = 1 : 8


ratio of radius = 1 : 2


Ratio of surface area = (ratio of radius)2


Ratio of surface area = 1 : 4

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