A triangular pyramid is a pyramid having a triangular base. It has 4 faces, 6 edges and 4 vertices.
Since the area of one face is 25 [tex] in^{2} [/tex]
Therefore, surface area of triangular pyramid = 4 [tex] \times [/tex] area of one face
= [tex] 25 \times 4 [/tex]
= 100 [tex] in^{2} [/tex].
So, the surface area of triangular pyramid is 100[tex] in^{2} [/tex].
Therefore, color is red.
