i got n=21 and for m i got m=45 and this is how i subtracted 180-138 then i got 42 and i divided 42/2 because if the right angle was n the one on the left side is n also and for the m i did 180-90 because 90 was the right angle in the corner so 180-90 is 90 then i divided it by 2 because their is 2 m so 90/2m would be 45
~hope that helps :)
