Question

suppose a triangle has two sides of 2 and 5 and that the angle between these two sides is 60 degrees. what is the length of the third length of the triangle (Please help me i really need it )

Answer 1

Do you know the cosine rule?

Answer 2

yes but its still kind of confusing

Answer 3

Can you apply the values to the cosine rule and show?

Answer 4

Solve for \(x\),
\(cos(60^{\Large\cdot})=\Large\frac{2^2+5^2-x^2}{2(2)(5)}\)