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# Geometry question concerning triangular prism formulas here, NEED HELP, ASAP!!?

What are the formulas for finding the length, height and slant height of a triangular prism given the surface area?.. Please help me!

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- Anonymous1 decade agoFavorite Answer
Triangular Prisms don't have slant height. Do you mean a triangular pyramid?

Triangular Prism Formula

Surface Area= 2b + Ph

(b is the area of the base P is the perimeter of the base)

Triangular Pyramid Formula

Surface Area = [Base Area] + 1/2 × Perimeter × [Side Length]

SA = B + 1/2 P L (cursive l)

B = l x h

If you know the SA you can solve for the other variables.

Triangular Pyramid

(2SA - lh) / P = L (slant height)

h= (SA - 1/2 P L(slant height)) / l

l = (SA - 1/2 P L (slant height)) / h

Source(s): http://math.about.com/library/blmeasurement.htm http://www.mathsisfun.com/geometry/triangular-pyra... - Anonymous5 years ago
Formula to find what? if it is volume you multiply the area of the triangle by the height of the prism.

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