Hi,

Apologize, misread the question:

 ∠c = ∠1 - ∠2  0r ∠1 = ∠c + ∠2  

To my knowledge, the idea would be to construct varius examples, that is,

different sizes for angle c and angle 2  and show how that effects the size

of that angle 1.  Might recommend showing angle 1 at 90°(2 & c complementary angles)

 and ∠1 at 180°(c & 2 suplementary angles forming a 'straight line')

One ex below where angle ∠1 < 90°

 

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