From the problem, we have a triangle with base of 15 cm and a height of 18 cm.
The area of the triangle is :
[tex]A=\frac{bh}{2}[/tex]
where b = base and h = height.
Using the formula above, the area will be :
[tex]A=\frac{15(18)}{2}=135[/tex]
The answer is 135 cm^2
