What is the missing reason for line 4 in this proof? A
С
1
3
E
B
D
Given: 2123
Prove: 22 and 23 are supplementary
Statement
Reason

step-by-step explanation:

a and d

x² + 11x + 18 < 0  

[-11 ± sqrt(121 - 72)]/2 = (-11 ± 7)/2  

solution: (-9, -2)

step-by-step explanation:

m∠5 + m∠3 = m∠1   is true.

m∠5 + m∠6 = 180 is true

m∠2 +m∠3 = m∠6   is true

m∠2 +m∠3 +m∠5 = 180   is true

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