How to find total surface area for a triangular prism

bh + 3lw

Step-by-step explanation:

A triangular prism is made up of two opposite rectangular surface, two opposite triangular surfaces and its rectangular base.

Area of a triangle = bh

where b is its base, and h is the height.

Total surface area of the two triangular surfaces = bh + bh

                                                     = bh

Area of rectangle = lw

where l is the length and w its width.

The surface area of the rectangles = lw + lw + lw

                                                       = 3lw

Thus,

Total surface area for a triangular prism = bh + 3lw

distance covered by pamela in 9 l of fuel = 99km

let us apply unitary method here.

distance covered by pamela in 1 l of fuel =99/9 =11 km

now let us find distance covered by pamela if she has 12 l of fuel.

distance covered in 12 l = distance covered in 1 l of fuel * 12

we know that distance covered by here in 1 l is 11 km.

so distance covered in 12 l of fuel = 11*12 = 132 km.