Question

CERTAIN ANSWERS ONLY!!! There should 4 answers, thank you in advance. It may be a bit difficult sorry. Thank you :)

Answer 1

i can't understand sorry

Explanation:

Answer 2

See Below.

Explanation:

We are given that ∠1 and ∠7 are supplementary.

And we would like to prove that a is parallel to b.

Statements: Reasons:

`\textbf{\textsf{1. $\angle 1$ and $\angle 7$ are supplementary}}` Given

`\textsf{2. $m\angle3$ + $m\angle 7$ $= 180$}` Supplementary Angles

`\textsf{3. $\angle3$ and $\angle7$ are supplementary}` Definition of Supplementary

`\textsf{4. }\bf{\angle 1 \cong \angle3}` Congruent Supplements Theorem

`\textsf{5. }a\parallel b` Corresponding Angles Converse

And we are done!