# Math Help - triangle trig

1. ## triangle trig

The vertex angle of isoceles triangle is 57 degrees 24 minutes and each of its equal sides is 375.5ft long.find the altitude of triangle.

2. Originally Posted by harry
The vertex angle of isoceles triangle is 57 degrees 24 minutes and each of its equal sides is 375.5ft long.find the altitude of triangle.
Drop an altitude and use trigonometric ratios to solve for x:

$cos23.7=\frac{375.5}{x}$
$x\approx 410.09$