Answer:28.50
I’m doing a lesson for iready and I had the same question
A triangles angles all add up to 180*. so 90*+50*+40*=180*
Answer:
Use the cosine rule
Step-by-step explanation:
1. Apply formula of c^2 = a^2 + b^2 - 2abcosC
2. Substitute known values in: c^2 = 36 + 4900 - 840cos120
3. Apply algebra and use the calculator
4. Final answer is 73.18 (2 decimal places)
