Find the area of a parallelogram with vertices (0, 0), (3, 3), (4, 6), and (7, 9) using the formula which relates the area to the absolute value of the determin

Question

              I do not know how to work this out                                                            

Answer 1

Draw and label a diagram.

A (0, 0), B (4, 6), C (7, 9), D (3, 3)

Shear CD down to x axis. 

Parallelogram is 1 unit wide by 6 units high

Area is 6 square units.