I. Given: ALMN; mLL >mLN M Prove: MN > LM Proof: Indirect Proof: Assume MN LM Statements Reasons 1. By assumption MN 1. MN = LM or LM 2.Definition of MN 2. Considering LM : If MN LM then 3. Base angles of isosceles As are congruent 3. L 4. The conclusion that 4. The assumption MN IMis 7. the given that 5. Theorem 5. Considering MN < LM If MN LM Then m 7. < m 7. 6. The conclusion that m 6. The assumption is 7. m 7. Therefore, must be 7.
I. Given: ALMN; mLL >mLN M Prove: MN > LM Proof: Indirect Proof: Assume MN LM Statements Reasons 1. By assumption MN 1. MN = LM or LM 2.Definition of MN 2. Considering LM : If MN LM then 3. Base angles of isosceles As are congruent 3. L 4. The conclusion that 4. The assumption MN IMis 7. the given that 5. Theorem 5. Considering MN < LM If MN LM Then m 7. < m 7. 6. The conclusion that m 6. The assumption is 7. m 7. Therefore, must be 7.
Elementary Geometry For College Students, 7e
7th Edition
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
ChapterP: Preliminary Concepts
SectionP.CT: Test
Problem 1CT
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Transcribed Image Text:Direction: Prove that one side is greater than the other side by
completing the two-column proof below.
HTAM
L.
Given: ALMN; mLL >m2N
M
Prove: MN > LM
Proof:
Indirect Proof: Assume MN LM
Statements
Reasons
1. By assumption
MN
1.
=LM or
MN
LM
く
%3D
2.Definition of
MN
2. Considering
LM
If
MN
LM
welgns
3. Base angles of isosceles As
are congruent
then
3. 2
4. The conclusion that
>め
4. The assumption MN TMİ.
the given that
Theorem
5. Considering
MN LM
MN
If
LM
Then m
<m²
6. The conclusion that m
6. The assumption
is
<m
The given that m
L>m N
7.The assumption that
contradicts the known fact that m
7. Therefore,
must be
5.
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