web analytics

Ex 13.4, 6 - Find radius of a sphere whose surface area - Area Of Sphere

  1. Chapter 13 Class 9 Surface Areas and Volumes
  2. Serial order wise
Ask Download

Transcript

Ex 13.4 , 6 Assume ฯ€ = 22/7, unless stated otherwise. Find the radius of a sphere whose surface area is 154 cm2. Let r be the radius of the sphere. Surface area = 4๐œ‹๐‘Ÿ2 154 cm2 = 4๐œ‹๐‘Ÿ2 154 cm2 = 4 ร—22/7ร—๐‘Ÿ2 154 ร— 7/(22 ร— 4) cm2 = ๐‘Ÿ2 ๐‘Ÿ2 = 12.25 r = โˆš12.25 r = 3.5 Thus, the radius of the sphere is 3.5 cm

About the Author

Davneet Singh's photo - Teacher, Computer Engineer, Marketer
Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He provides courses for Mathematics from Class 9 to 12. You can ask questions here.
Jail