3.1

a quantity that requires both the magnitude and direction for a complete description is a vector quantity.

a quantity that is completely described by magnitude only is a scalar quantity

3.2

the result of adding these two vectors, called the resultant is the diagonal of the rectangle.

for any square the length of its diagonal is route 2 or 1.414 times either of the sides

questions

4. a diagonal line

19. 150\250

21. 50?