Question

Use the rectangle below. Show all work.
A. Find the perimeter
B. Find the area

Answer 1

I don't really understand how to find the area using the diagonal line.

Answer 2

use Pythagoras to find the third side of the triangle (i.e. the edge of the rectangle)

the area and perimeter are then trivial calculation of a rectangle - knowing its 2 sides

Answer 3

If you know about 'pythogorean triples' (e.g. 3,4,5 or 5,12,13 etc.) then you should be able to work out the third side very easily without a calculator