Given that is a parallelogram, find the area of .
Step 1: Use the formula for the area of a parallelogram to find the area of parallelogram .
Step 2: Find the area of .
First, determine the length .
Opposite sides of a parallelogram are equal in length.
Since , we know that is bisected into two equal lengths.
Then use the formula for the area of a triangle, with as the base and cm as the height.
Step 3: Find the area of .
Subtract the area of from the area of parallelogram .