Which expression can be used to find the surface area of the following square pyramid?

Given a circle with measures of (c, d, and r) and a circle with measures of (c', d', and r'), what is d if c c' = 12 and d' = 0.50? a) 3 b) 6 c) 12 d) 24

Solve for x where 0 equation: cot^2x+2cotx+1=0

Pleas its really urgent and i would really appreciate it! what is the value of x? enter your answer in the box. x =