Question

An oblong measures 15 cm by 8 cm. find the angle between its diagonal and a longer edge answer

Answer 1

For this case you can model the problem as a rectangle triangle where you have the length of the opposite leg and the adjacent leg.
Therefore, the angle sought is given by:
theta = Atan (8/15)
theta = 28.07 degrees
Answer:
The angle between its diagonal and a longer edge is:
theta = 28.07 degrees