Answer:
14.4
Step-by-step 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
