Posted by **Ivan** on Sunday, January 16, 2011 at 12:44am.

Compute the area of a triangle with sides.

15 × 15 × 18

a = How many square units?

- Geometry -
**drwls**, Sunday, January 16, 2011 at 1:46am
There is a formula for the area of a triangle in terms of the side lengths.

Don't ask me to derive it. Here it is:

Let s = (a +b +c)/2

a,b and c are the side lengths.

For your triangle, s = 24

Area = sqrt[s*(s-a)*(s-b)*(s-c)]

= sqrt[24*9*9*6) = 108 square units

Check: Your triangle is isosceles and if you drop a line from the apex to the middle of the base, you have two

9:12:15 right triangles. The area of each is (1/2)(9*12) and that makes a total area of 108.

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