How do you use Heron's formula to determine the area of a triangle with sides of that are 25, 28, and 27 units in length?

1 Answer
Jim G.
Jul 3, 2016

≈ 305.94 square units

Explanation:

This is a 2 step process.

Step 1 Calculate half the perimeter (s ) of the triangle.

color(red)(|bar(ul(color(white)(a/a)color(black)(s=(a+b+c)/2)color(white)(a/a)|)))
where a ,b and c are the sides of the triangle.

let a = 25 , b =28 and c = 27

rArrs=(25+28+27)/2=80/2=40

Step 2 Calculate the area (A ) using the formula.

color(red)(|bar(ul(color(white)(a/a)color(black)(A=sqrt(s(s-a)(s-b)(s-c)))color(white)(a/a)|)))

rArrA=sqrt(40(40-25)(40-28)(40-27))

=sqrt(40xx15xx12xx13)≈305.94" square units"

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