# An acute angle θ is in a right triangle with cos θ = 3 / 5 . What is the value of sec θ?

We will use the concepts of trigonometry to find the value of sec θ.

## Answer: sec θ = 5 / 3

Let us use the concept of trigonometry to find the value of sec θ.

**Explanation:**

It is given that in a right-angled triangle, cos θ = 3 / 5.

We all know that sec θ = 1 / cos θ.

Hence, substituting the values in the formula of sec θ we get sec θ = 5 / 3