Question

1 and 2 are complementary angles 2 and 3 are supplementary angles if 1=45 find the measure of 3

Answer 1

If 1 and 2 are complementary angles .
1+2=90
If 1 = 45(given)
Then 2=90-45
=45
2 and 3 are supplementary angles.
2+3=180
3=180-45
=135
Hence the measure of 3 is 135 degrees.
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Hope it helps u....

Answer 2

if 1 and 2 are  complementary 
so  1+ 2 = 90 
      1= 45 ( it is given in question )
let 2 be x 
    45 + x = 90 
     x= 90-45
      x = 45
    


now 2 = 45
    2 and 3 are  supplementary angles =  2 +  3 = 180
     let 3 be y 
     so 45 +y =180
                  y= 180-45
                 y = 135

so the measure of angle 3 is 135


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