What is the area of triangle def? round to the nearest tenth of a square unit.
10.3 square units
18.0 square units
20.0 square units
20.6 square units

Since we are given 2 sides and 2 angles, we can use the Side Angle Side (SAS) method. The area of a triangle is given by the formula:
Area = absinC/2; where a and b are adjacent sides and C is the angle between a and b.

Area = 5*8*sin31°/2 = 10.3 square units.

Answer: 900°

good luck on your studies! : )

david edward.