Write a two-column proof

1. angle r is congruent to angle u                     1. given

2. segment rq is congruent to segment qu      2. given

3. Q is a midpoint          3. If divided into 2 congruent segment then a midpoint

4. sq is congruent to qu   4. if midpoint then divides into 2 congruent segments

5. triangle sqt is isosceles    5.

Step-by-step explanation:

for the last five you prove it by aas, sas, rhl... but i don't know which one it is

you could deduce the conclusion directly using the facts pertaining to the specific situation.

hope this .

the answer to this is a. a^2 + b^2 = c^2