Question

Find the area of the triangle; AB = 5, BC = 8 and ∠CAB = 60

• A. 20√3
• B. 10√3
• C. 15√3
• D. 12

Answer 1

Answer:

B. 10√3

Using the SAS are formula

Area = 1/2 × (side 1 ) x (side 2) × sin(included angle)

= 1/2 × 5 ×8 x sin60

= 20 × √3/2

= 10√3 sq units