Question

Find the surface area of the regular tetrahedron.
Round to the nearest hundredth.

Answer 1

A= Root 3 a squared 
Using this formula 
your answer is 62.35

Answer 2

4 triangles, all the same:

each side is an equilateral triangle:

A = 1/2*6*h, h = sqrt( 6^2 - 3^2) = 3*sqrt(3), A = 9*sqrt(3)

Total = 36*sqrt(3) = 62.35382907247957

Nearest hundredth: 62.35