Question 662201
  <pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
Apologize, misread the question:
 &#8736;c = &#8736;1 - &#8736;2  0r &#8736;1 = &#8736;c + &#8736;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 &#8736;1 at 180°(c & 2 suplementary angles forming a 'straight line')
One ex below where angle &#8736;1 < 90°
{{{drawing(300,300,-1,3,-1,3,
locate(.4,.2,2),arc(0,0,1.4,-1.4,0,30),
locate(-.14,.05,1),
locate(.45,.5,c),arc(0,0,1.7,-1.7,30,50),arc(0,0,1.8,-1.8,30,50),
line(0,0,2,0),line(2cos(50*pi/180),2sin(50*pi/180),0,0), line(2cos(30*pi/180),2sin(30*pi/180),0,0) )}}}