What you have written on the triangle. The angle is what goes inside the trig functions (Sine, Cosine, Tangent). The side opposite of the 36° angle is MP. The Hypotenuse of the triangle (always the longest side) is side PN. The Adjacent side to the 36° angle is given to be 28.
Use trig functions containing the given Adjacent side to solve for the missing sides Opposite, P and Hypotenuse, H .
Opposite side (calling it "P") Tan(36°) = P / 28 multiply by 28 on both sides 28 × Tan(36°) = P 20.34 = P
Hypotenuse of the triangle (H) Cos(36°) = 28 / H Cross multiply H = 28 / Cos(36°) H = 34.61