Answer:
9 cm
Explanation:
Find the area of the 1st triangle
A=1/2 b*h
1/2 3*3
1/2 9
4.5
Find the area of the 2nd triangle
A=1/2 b*h
1/2 3*3
1/2 9
4.5
Both triangles have an area of 4.5
To find the area of the parallelogram you have to add the area of the triangles
4.5+4.5=9
A= 9 cm