Hello There!
First let me say this. I did not like how this question was worded I am a tutor in math and I had to read this problem over and over 5 times. It was confusing but I managed to figure it out. The answer is 61%
My work is shown on paper
Angle 1 and 3 are equals and 2 and 4 are the same
The answer is: 
The explanation is shown below:
1- You have the following expression given in the exercise:

2- When you multiply signs, you obtain:

3. Now, you must add like terms, as following:

4. Therefore, you have that the expression simplified is:

All you really have to do is find the measure of angle T - if T=R then when you find the measure of T then it will also = R
Answer:
i think the correct measures are 5,12,13
Step-by-step explanation: