Question

Find the area of an isosceles triangle with 29 ft legs and 40ft base.

Answer 1

you can find the height using pythagoras, can't you?

Answer 2

\[ A_{triangle} = \left(\frac{1}{2}\right)bh; ~~b=40 \]
We can figure out h because it is the perpendicular bisector of the opposite side that we do know. We may use Pythagorean Theorem to figure out the length of h.