## Geometry: Common Core (15th Edition)

Answer: $A=135cm^2$
11. We are already given that $h$ will represent the height corresponding to the $18 cm$ base. We also know that one of the parallelogram's sides equals $15cm$. We are also informed that the height of the triangle, traced outside of the shaded region of the parallelogram, corresponds to the $15cm$ hypotenuse, which equals $9cm$. Given all the information, we just need to figure out the area of the parallelogram. 12. The formula of the area of a parallelogram is: $A=bh$. We are going to plug in the given base and height: $A=15 * 9$ $A=135$ 13. The area of the parallelogram is $135cm^2$