Find the area of the triangle. round the answer to the nearest tenth.

a.
27.1 square units
b.
29.0 square units
c.
178.3 square units
d.
356.6 square units

The correct option is C.

Step-by-step explanation:

Given information: AB=20.4, BC=17.7 and ∠ B = 99 °.

It two sides and their inclined angle is given then the area of the triangle is

Where, a and b are two sides of a triangle and C is their inclined angle.

The area of given triangle is

The area of the triangle ABC is 178.3 square units. Therefore the correct option is C.

m∠a is 90°

m∠b is 40°