The base of the triangle starts horizontally from 0 to 7
b = 7 - 0
b = 7
The height of the triangle start vertically from 1 to 15
h = 15 - 1
h = 14
Calculate the area
a = 1/2 × b × h
a = 1/2 × 7 × 14
a = 1/2 × 98
a = 49
The area of the triangle is 49.0 units²