In grade 9 math i got homework about finding the area of an isosceles triangle and i don't know how to find the area.

Thanks,

Josh

Printable View

- October 21st 2006, 12:17 PMjosh16Area of an Isosceles Triangle
In grade 9 math i got homework about finding the area of an isosceles triangle and i don't know how to find the area.

Thanks,

Josh - October 21st 2006, 12:22 PMIdeasman
The area of an isosceles triangle, and any triangle for that matter, is:

(1/2)*b*h, where b is the base and h is the height. Further, for an ISOSCELES triangle, height can be found by the following formula:

h = sqrt[(b^2 - (1/2)*a^2)]

The area of an isosceles triangle can also be found using trigonometry, but I am assuming you are not quite up to that level yet.

Another formula you can consider using is Heron's formula.

Given a triangle with sides of length a, b, c, the area of the triangle is:

A = sqrt(s*(s-a)*(s-b)*(s-c)),

where s = (a + b + c)/2. - October 21st 2006, 12:30 PMAfterShock