If one pair of opposite sides of a quadrilateral is congruent and parallel, then the quadrilateral is a parallelogram. He draws the figure below and begins his proof. AB= DC Given: AB || DC Prove: ABCD is a parallelogram Statements Reasons AB = DC 1. Given 1. AB || DC 2. Z BACZDCA 2. ? What should be Thomas's reason for Step 2? O If parallel lines are cut by a transversal, alternate interior angles are congruent. O If parallel lines are cut by a transversal, corresponding angles are congruent. O Vertical angles are congruent. O Congruent parts of congruent triangles are congruent.

Elementary Geometry For College Students, 7e
7th Edition
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
Chapter4: Quadrilaterals
Section4.3: The Rectangle, Square, And Rhombus
Problem 42E: a Argue that the midpoint of the hypotenuse of a right triangle is equidistant from the three...
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What should be Thomas’s reason for Step 2?
P 2. Thomas needs to prove the following theorem.
If one pair of opposite sides of a quadrilateral is congruent and parallel, then the quadrilateral is a parallelogram.
He draws the figure below and begins his proof.
B
AB DC
Given:
AB I| DC
Prove: ABCD is a parallelogram
Statements
Reasons
AB= DC
1.
1. Given
AB I| DC
2. Z BAC DCA
2. ?
What should be Thomas's reason for Step 2?
O If parallel lines are cut by a transversal, alternate interior angles are congruent.
O If parallel lines are cut by a transversal, corresponding angles are congruent.
O Vertical angles are congruent.
O Congruent parts of congruent triangles are congruent.
Transcribed Image Text:P 2. Thomas needs to prove the following theorem. If one pair of opposite sides of a quadrilateral is congruent and parallel, then the quadrilateral is a parallelogram. He draws the figure below and begins his proof. B AB DC Given: AB I| DC Prove: ABCD is a parallelogram Statements Reasons AB= DC 1. 1. Given AB I| DC 2. Z BAC DCA 2. ? What should be Thomas's reason for Step 2? O If parallel lines are cut by a transversal, alternate interior angles are congruent. O If parallel lines are cut by a transversal, corresponding angles are congruent. O Vertical angles are congruent. O Congruent parts of congruent triangles are congruent.
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