Question

Need a lot of help on this one

Answer 1

You an use distance formula or pythagorean theorem to fine the length and width of both rectangles. Your final answer will be the area (l*w) of the big rectangle minus the area of the little rectangle.

Answer 2

The area of pool border = area of total pool - area of pool border.
and to calculate area go for area of rectangles

Answer 3

What is the area of total pool

Answer 4

U can proceed as @hullsnipe explained. take from origin as a triangle to get the length . for breadth u can use distance formula using coordinated .