help with triangles

You can use the Law of sines :

sin (70) / 25  =  sin C / 26        then sin C = .97728     C = ARCSIN ( .97728 ) = 77.76 degrees 

Now, you should know there are 180 degrees in the sum of the interior angles of a triangle :

 

Then angle B = 180 - 70 - 77.76 = 32.236 degrees      the sin of which is .5334