Area of Triangle in Rectangle

In the diagram below, rectangle ABCD has a width of 8 units and a length of 5 units. Point E is the midpoint of side AB. The area of triangle ABE is needed to be calculated. What is the area of triangle ABE?

Recall that the area of a triangle can be found using the formula:

$$ ext{Area} =\frac{1}{2} imes ext{base} imes ext{height} $$