MathMaster Blog

We can find the cosine of an angle in a right triangle by dividing the length of the adjacent side by the length of the hypotenuse. Find the cosine using the formula:

cos(θ) = adjacent/hypotenuse

Example 1:

Find the cosine of the angle:

Solution:

Example 2:

Find the exact value of cos(pi/2).

Answer: The exact value of cos(pi/2) is 0.