Area of a triangle is equal to 1/2 b(h) so since you already have the height and base, all you need to do is input it back into the equation:
(10)(13)
Multiply 10 & 13 to equal
(130)
Then take half of 130 to get
A = 65
Multiply 10 & 13 to equal
Then take half of 130 to get
A = 65