Question

Find BC the length not the angle


Round to the nearest tenth.

Answer 1

14.4

Explanation:

We solve the above question using Cosine Rule

The formula is given as:

BC² = AB²+ AC²﹣2 × AB × AC cos A

BC² = 6² + 13²﹣2 × 6 × 13 × cos(91°)

BC = √6² + 13²﹣2 × 6 × 13 × cos(91°)

BC = 14.41258

Approximately

BC = 14.4