What is the value of x in the triangle?
Round your final answer to the nearest hundredth.
This is a right triangle, and we know the length of the hypotenuse, and we want to find the length of the side adjacent to the 18° angle.
cos(an angle) = length of side adjacent / length of hypotenuse
cos 18° = x / 25 Now multiply both sides of this equation by 25 .
25 cos 18° = x
x = 25 cos 18° Plug this into a calculator to get...
x ≈ 23.78 cm