X = fraction 1 over 12
x = fraction 1 over 3
x = 3
x = 12
The given choices are the successive steps to solve the question :fraction 1 over 6x = 2
of which the last choice is the solution.
Parameterize the part of the sphere by

with

and

. Then

So the area of

(the part of the sphere above the cone) is given by
The answer is -29, hope this helps
No, ΔPʹQʹRʹ is a reflection of ΔPQR over the x-axis