Answer:
40 units²
Explanation:
First find the length of one of the longer sides. This length is found using the Pythagorean Theorem:
L = √[ 8² + 4² ] = √[ 80 ] = 4√5.
Similarly, the width is W = √[ 2² + 4² ] = √[ 20 ] = 2√5.
The area of the rectangle is A = L * W = (2√5)(4√5) = 8(5) = 40 units²