Question

The coordinates below are the three vertices of a rectangle. Identify the fourth coordinate and the area of the rectangle.
A.(2,7),28

B.(2,7),48

C.(7,2),28

D.(7,2),45

Answer 1

The answer is D

This is because the x value of the coordinate has to be the same x coordinate is point c, which means it has to be 7. And the y coordinate has to be the same as point A, which means that the y coordinate has to be 2. 
Leaving the coordinate at (7,2)

Then the area of the rectangle is 45 because when you count the length between points B and C (the length) is 9, and the width (between A and B) is 5. You get 45 by multiplying these values because the area of a rectangle is length times width.