Jim S.

asked • 01/22/19

Please help me with this proof. I have provided the statements, please help me fill in the reasons.

For this assignment, I need to provide the Converse of the Side-Splitter Theorem. I do not understand how to do this. Please help.


Given:

XRYS

RQ SQ


Prove:

RS||XY


Statements:


2. XR + RQ YS+SQ

SQ RQ

3. XQ = YQ

RQ SQ

5.∇XQY ∼ ∇RQS

6.∠1 ≅ ∠2

7.RS||XY


Reasons:

2.

3.

5.

6.

7.


1 Expert Answer

By:

Paul M. answered • 01/22/19

Tutor
5.0 (39)

BS Mathematics, MD

Jim S.

can you please give me the statements for what you are saying?
Report

01/23/19

Paul M.

tutor
First of all, with respect to what I wrote previously, I have given the reasons in the statements. Look for the word "because" in my statements; what follows is the "reason". Secondly, I missed the fact that you wanted the Converse. The converse is that If a line cuts 2 sides of a triangle in such a way that the sides are cut proportionally, then the line is parallel to the uncut side. The proof goes like this: Since the sides are in proportion, then the small triangle and the large triangle are similar. That makes the angles equal (corresponding parts of similar triangles). Then the lines are parallel because when two lines are cut by a transversal in such a way that the corresponding angles are equal, the lines are parallel. Lastly, what I have given you depends on theorems about similar triangles. In point of fact, your "Side Splitter Theorem" is usually proved BEFORE the proofs about similar triangles. That proof is not difficult but it is hard to visualize and involves the areas of triangles within the original triangle. You can look it up on line or I may be able to send it to you somehow.
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01/23/19

Jim S.

Thanks so much!
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01/24/19

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