I need the tsa of a triangular prism

The answer is 840ft2

Step-by-step explanation:

for the two rectangles, use the formula: length x width

15 x 13 = 195

Since you have two rectangles on each sides, multiply by 2

45 x 2 = 390ft2

for the triangle, use the formula: base x height

                                                                    2

18 x 12

    2

=  108

since you have 2 triangles (one at the front, one at the back), multiply by 2

108 x  = 216ft2

For the rectangle on the bottom

18 x 13 = 234ft2

Add for the TSA

234 + 390 + 216 = 840ft2

answer: the resulting cross section is a rectangle. solution: a plane parallel to the base of a triangular prism will intersect a cross section that is the same shape as its bases. so the cross section is a triangle.

step-by-step explanation: