Answer: 27.5 units^2
Explanation:
The formula to find the area of a triangle is Area = 1/2 x Base x Height
The base of the triangle is 11 since it starts at 2 and ends at 13
The height of the triangle is 5 since it starts at 4 and ends at 9
so plugging in base and height to the formula
A = 1/2 x 11 x 5
A = 1/2 x 55
A = 27.5