de has endpoints d(0,3) and e(0,12). find the length of de and round to nearest tenth

Question

im stuck on how to solve this problem

Answer 1

The formula for the length of a line segment is naturally the same as the formula for the distance between two points, or sqrt((x1-x0)^2+(y1-y0)^2).  In this instance:

sqrt((0-0)^2+(12-3)^2))=sqrt(0+81)=9

As a way of understanding the solution, you may want to graph the two points and see that the distance between them is, in fact, nine.