# In triangle PQR, PQ is 5 units long and PR is 8 units long. If angle 𝑄 is 85∘. Find the size of angle 𝑅 to 3 significant figures.

## Question

## Solution 1

To solve this problem, we can use the Law of Cosines. The Law of Cosines states that for any triangle with sides of lengths a, b, and c, and an angle γ opposite the side of length c, the following relationship holds:

c² = a² + b² - 2ab cos(γ)

In this case, we know the lengths of sides PQ and PR (w Knowee AI is a powerful AI-powered study tool designed to help you to solve study problem.

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