Find the value of each variable for the right triangles. make sure all answers are in reduced radical from. shoe your work.

Denote each of the triangles ABC, where B is the right angle.

a.



instead of taking the square of 12 and 13, , take 12 squared to the right side and apply the difference of squares formula: 



so t is square root of 25, which is 5

b. 







b.





here we can factorize 9, to work with small numbers: