The surface area of a triangular prism. The base is a right triangle with base 1 foot, height 2 feet and third side 2 point 2 feet. The height of the prism is 3 feet.

4 answers

2 + 3 (1 + 2 + 2.2)
If your base is 1 ft, by 2 ft, by 2.2 ft, it is NOT a right angled triangle

1^2 + 2^2 ≠ 2.2^2

check your question or your typing
Where is the vertex of the pyramid in relation to the base?
That will affect the slant heights of the faces.
IF it is a right-angled triangle with base 1 and height of 2, then we
need to find the third side.
Make a sketch of a triangle with base 1 and side of 2.2, draw a
perpendicular from the end of the 2.2 to the base, label it height = 2
Let A be the vertex of segment 2.2 and the base 1
sin A = 2/2.2 = .9090...
angle A = 65.38°

thirdside^2 = 1^2 + 2.2^2 - 2(1)(2.2)cos 65.38
= 4.007
third side = √4.007 = 2.002

So for all practical purposes, R_scott's answer is correct