Find the coordinates of the fourth vertex. Then, find the area of the rectangle.

Question

Three vertices of the rectangle are A(1,-5), B(1,3) and C(10,3)

Answer 1

What do you know about rectangles? 

     Parallel sides, right angles (perpendicular at the corners)

You can use that to find the fourth vertex.

 

Then use the length of each side to find the area (area of a rectangle = base * height).

 

Graphing the rectangle on a coordinate plane wouldn't hurt.