Given: `delta`abc prove: the sum of the interior angle measures of `delta`abc is 180°. what is the missing step in this proof?

Statement 3:.

Reason:Alternate Interior  Angles Theorem

Step-by-step explanation:

We are given that  a triangle ABC.

We have a proof  that the sum of interior angle measures pf triangle ABC is .

We have to find the missing steps in the given proof.

Statement 1 :Let  points A,B and C  form a triangle.

Reason: Given

Statement 2: is a line passing through B and parallel to with angles as labeled.

Reason: Definition a parallel line and labeling angles.

Statement 3:.

Reason:Alternate Interior  Angles Theorem

Statement 4:

Reason: Congruent angles have same measures

Statement 5

Reason: Angle addition and definition of a straight angle

Statement 6: [ytex]m\angle 1+m\angle 2+m\angle 3=180^{\circ}[/tex]

Reason : By substitution

Hence proved.

answer for #1 is c

answer for #2 is d

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i think it would be c

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step-by-step explanation: