### Home > PC > Chapter 10 > Lesson 10.1.1 > Problem 10-10

10-10.

Copy the vector diagram on graph paper.

Draw vectors equivalent to

**r**and**q**so that you can add them easily.Draw and label the resultant vector,

**r**+**q**.Using the same initial point, draw and label

**q**+**r**.Move vectors

*r*and*q*above to show*q*+*r*.The quadrilateral you just drew has a special name. What is it?

**Challenge**: You can prove that**r**+**q**=**q**+**r**by proving that your answer to part (d) is true. Use what you remember from geometry to justify the special name.