Answer:
36
Explanation:
180 degrees in a triangle
that little square means its a right angle therefore it is 90 degrees
90+54=144
180-144=36
Hey There!
So if you didn't know all of the angles in a triangle add up to equal 180
so to find the missing angle we subtract the given angles from 180
180-90-54=36
therefore the missing angles is 36
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