3. What is the area of the triangle below?
A)6.0ft^2
B)8.6ft^2
C)15.0ft^2
D)17.2ft^2

B

Step-by-step explanation:

Given a triangle with 2 sides and the included angle then area (A) is

A = ab sinC

here a = 7, b = 3 and C = 55°, thus

A = 0.5 × 3 × 7 × sin55° = 10.5 × sin55° ≈ 8.6 ft² → B