Proofs on a Triangle (Statements and Reasons Needed.

[BlahGirl]

I seriously don't know what to do after the given statement. Could anyone explain in detail to me what to do?

 

[Pedja]

Hi. Do you know what is the sum of interior angles of any triangle? Also, do you know what is the sum of interior angle and its adjacent exterior angle?

 

[Harry_the_cat]

Another way to do it: D What is the size of angle TUS?

 

[blamocur]

And once you prove it you might discover that angle S isn't actually 95