Question

prove that the sum of 3 angles of a triangle is two right angle

Answer 1

X = smaller acute angle in right triangle 
4x = larger acute angle 
90 = right angle 

x + 4x + 90 = 180 
5x = 90 
x = 18 
4x = 72 

Acute angles are 18° and 72°

Answer 2

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