Question 1054267
x is angle
90-x is complement
180-x is the supplement
(90-x)^2-90=3(180-x)
8100-180x+x^2-90=540-3x
x^2-177x+7470=0
x=(1/2)(177+/- sqrt (177^2-29880); sqrt term=38.07 
x=(1/2)(177+/-38.07)
x=107.58, has no complement
x=69.467 angle, complement is 20.533, complement squared is 421.599, supplement is 110.533, multiplied by 3 is 331.599, subtract 90 from 421.599 and get 331.599.
The angle is 69.47 degrees.
Check: 70 should be close
complement is 20, supplement 110
complement squared is 400, but that is 70 more than 3 times the supplement.
Try 69
Complement is 21, supplement is 111
square of complement is 441, 3 times supplement is 333, and that is 108 less than the complement.