If one side of the base in the last figure measure 20 cm, the edge from the vertex at the vertex at the top and anyone of the base measure 13cm and the area of the base is 1039.23cm2. find the total area of the pyramid

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.

0

step-by-step explanation:

equals the constant of proportionality.

solve for

54/3 is 18 so 18 is your answer