Item 12 A regular triangular pyramid has a base and lateral faces that are congruent equilateral triangles. It has a lateral surface area of 63 square centimeters. What is the surface area of the regular triangular pyramid?

step-by-step explanation:

this is not possible to solve with the info given.   you need at least an one angle somewhere.

8

step-by-step explanation:

4 and 5)16.97 or 12√2

6)15.59 or 9√3

7)y = 15.59 or 9√3     x =27

8)17.80

a: inscribed angles

step-by-step explanation:

i reviewed this question with a peer and teacher, seems to be correct, me later