2. the perimeter of the triangle below is 4x + 3y. find the measure of the
missing side.
x -
у
x + y
3. the perimeter of a trapezoid is 39a - 7. three sides have the following
lengths: 9a, 5a + 1, and 17a - 6.
what is the length of the fourth side?

ddd

step-by-step explanation:

d

step-by-step explanation:

statement #3: proof- ang is congruent to ang ecd : angles are congruent.  

step-by-step explanation:

1: the missing angles in statement #3  

a.) acb  

reason- the reason why the answer is acb is because angle ecd and angle acb are both the same size *that's what the word congruent means this is really simple.  

2: the missing word in reason #3  

c.) vertical  

reason- the reason why the answer is vertical is because the angles in that diagram on figure 2 is slanted, which is vertical, and the e and a both lay on vertical lines. along with the other's, but e and a are the 2 main points you want to focus on. and c is kind of like your starting point, because c is for both angles, not just one.  

i hope that was and understanding.