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Secondary II • 3mo.
image.jpg

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?

Mathematics
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  • Explanation from Alloprof

    Explanation from Alloprof

    This Explanation was submitted by a member of the Alloprof team.

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    Team Alloprof • 3mo.

    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.

    image.png


    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:

    image.png


    I hope this is clearer for you! :)

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