Question

Suppose a triangle has side lengths 5 and 10 and the angle between the two sides is = pie/3. What is the area of the triangle?

Answer 1

The formula for triangle area in this case is
  A = (1/2)ab·sin(θ)
where a and b are the side lengths and θ is the angle between them.

Substituting the given values, you have
  A = (1/2)(5)(10)(sin(π/3))
  A = (25/2)√3