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Mathematics

Secondary 2 • March 27, 2025

hi! is it possible to use Aire totale = Pb • h + 2Ab to calculate the surface of this prisme if the base triangles are not équilatéraux? if not, how can i calculate the surface instead?

Answer (1)

Alloprof Answer

March 27, 2025

Hi!

The formula Aire totale = Pb • h + 2Ab doesn't only apply to prisms whose bases are equilateral triangles ;)
So, yes, you can use the formula to find the surface area of this prism.

The bases of this prism are isosceles triangles (we know this thanks to the bars that tell us that the two sides are congruent). So, you need to add these three measurements together to find the perimeter of the base:

I hope this is clearer for you! :)