A regular tetrahedron is a triangularbase edges of 7 cm?
pyramid. What is the total surface
area of a regular tetrahedron with
I started by using
1/2 × Perimeter × [Side Length] + [Base Area]
(1/2) (21) (?) + (sqrt(36.75))
So im not sure if this is the correct forumula or if the numbers i used to plug in are correct.