Need total surface area of a sphere

[curelnew]

d= 30 m

4 X 3.14(15^2)
4 X 3.14(225)= 2826 2826= surface area

 

[wjm11]

d= 30 m
Answers to choose from a)2826 m^2 b)942 m^2 c) 3532.5 m^2 d)42390 m^2
L=
4 X 3.14(R^2)
4 X 3.14(15^2)
4 X 3.14(225)= 2826 2826=L

The surface area of a sphere is just V = 4(pi)r^2, as you have done in the calculation of the variable you named "L." I don't understand what your other two calculations are for:

A=3.14(r^2)
3.14(15^2)
3.14(225)
706.50=A

TSA= L+ 2A
2826 + 2(706.5)
2826+1413=4239 My answer is 4239 m^2

 

[curelnew]

Thanks!