Mathematics

Find the radius of a sphere whose surface area is 154 cm2

Find the radius of a sphere whose surface area is 154 cm2
  • A.
    7.00 cm
  • B.
    3.50 cm
  • C.
    3.00 cm
  • D.
    1.75 cm
Correct Answer: Option B
Explanation
154 = 4 x22 x r2
7
154×7 = r2
4×22


 49/4  = r

7 = r
2

∴r = 3.50