Please help? Problem solving in Trig

Answer:
area = 596.8 ft²
Step-by-step explanation:
Since the triangle is isosceles then AC = BC = 35
∠ACB = 180° - ( 2 × 38.5)° = 103°
Area (A) is found using the area formula
A = [tex]\frac{1}{2}[/tex] absinC
= 0.5 × 35 × 35 × sin103° ≈ 596.8 ft²