Answer:
Step-by-step explanation:
Given
Length of diagonal is a
Diagonal divides the angle in 1:2
such that (because angle between two sides is 90)
width of rectangle is
Length of rectangle is
Area of rectangle
(4 1/3 * (-1) * 5) / 12 = -1.80555556
Explanation is in the file
tinyurl.com/wpazsebu