Suppose you threw a Frisbee and it landed on your roof, caught in the rain gutter. You want to know how high off the ground it is to the
rain gutter to determine if a 12-foot ladder will suffice. You walk ten feet away
from the house to place your mirror on the ground, and then walk another five feet until you see the gutter in the
mirror.

answer: 5

step-by-step explanation:

answer: the proof is mentioned below.

step-by-step explanation:

since, given:   lines bc = ef

prove:   lines ac > ef

          statements                                           reason

1. bc=ef                                           1. given

2. ac= ab+bc                                 2. because b is the point between the  

                                                            line segment ac

3.   ac > bc                                       3. because if a line segment is equal to

                                                          the sum of two line segments then it is

                                                          always greater then each of these

                                                          individual line segments

4. ac > ef                                         4. by equality property.