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TRIANGLES EQUAL TO 180
Add the two given numbers and subtract the sum with 180.
72 + 38 = 110
180 - 110 = 70
the third angle is equal to 70 degrees !!
2nd question/ picture:
the right angle symbol is equal to 90 degrees
r is 34 degrees
add the two numbers and subtract with 180
90 + 34 = 124
180 - 124 = 56
Q is equal to 56 !!

hope this helps :)

summary:

the third angle is equal to 70 degrees
Q is equal to 56