Question

Using Sarai’s measurements, Line 3 must be parallel to Line 5 according to which postulate or theorem?

Answer 1

Using Sarai's measurements, Line 3 must be parallel to Line 5 according to (A) Converse of Alternate Exterior Angles Theorem.

Alternate Exterior Angles theorem states that, "If two lines are parallel and they are intersected by same straight line then the alternative exterior angles formed by the figure are equal to each other."

Converse of the above theorem states that, "If two lines intersected by one transverse and formed alternate exterior angles, and if they are equal to each other then that two lines are parallel to each other."

Here in Sarai's measurement we can see that Line 3 and Line 5 are intersected by one straight line and the formed alternate exterior angles both are 65, which shows they are equal to each other.

Hence by Converse of Alternate Exterior Theorem we can say that Line 3 and Line 5 are parallel to each other.

So, Line 3 must be parallel to Line 5 according to Converse of Alternate Exterior Angles Theorem.

Hence Option (A) is correct.

Learn more about Alternate Exterior Angles here -

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