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Secondary I • 2yr.

How to calculate the area and the perimeter of this triangle:


Thank you!


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Explanations (1)

  • Explanation from Alloprof

    Explanation from Alloprof

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

    Team Alloprof • 2yr.

    Hello again!

    The perimeter is the measure of the outline of a figure. By adding all the sides, we can find it.

    Area is a measure of the area occupied by an object in 2 dimensions.

    So the perimeter of this triangle is just side a + side b + side c.

    Regarding the area of ​​a triangle, it is its base multiplied by its height ÷ by 2. You should know that the base of a triangle is always perpendicular to its height. So in your picture, the height corresponds to this (in red):


    So the height of this triangle is 5 cm.

    Now you are able to calculate your perimeter and area. 

    Have a nice day.


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