The first photo I provided an example of how my professor wants us to do it. It's confusing for me this is why I'm asking for help, thank you in advance :) Theorem 2.4.1The sum of the measures of the interrorangles of aA AB CProve: mcA+mcBtmk1 180triangle is 18o°.Given:T.A1. Given2 Paralled postulate : througha line there exists a unique line|to gren line3. for l lanes, alt. int. 2s are a ;21. AABC2. CB Il ABpoint noton3 2B 2 DCBZA LECAmeB= MLDCB, meA=m LECA5.LECB, LDCB are Suppl.4. Ls have = mias;5. adj. Ls w. ext. sides opp, rays4.6. m LECB t m LD CB =1807 m LECB3M LECAT melaresuppl; pret.6. Sum of meen. of uppl. s is80;5mees.1. Angle add. pests pict8. MCECA + mU + m LDCB = 1809.8. Sube titution, Gi?9. substitation;4,8+ m2i tmLB =180eop.LD CW 19 - 3/11Civen: AD IDC, BC LDClove: AD l BC2.3#19

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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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The first photo I provided an example of how my professor wants us to do it. It's confusing for me this is why I'm asking for help, thank you in advance :)

Theorem 2.4.1
The sum of the measures of the interror
angles of a
A AB C
Prove: mcA+mcBtmk1 180
triangle is 18o°.
Given:
T.
A
1. Given
2 Paralled postulate : through
a line there exists a unique line
|to gren line
3. for l lanes, alt. int. 2s are a ;2
1. AABC
2. CB Il AB
point not
on
3 2B 2 DCB
ZA LECA
meB= MLDCB, meA=m LECA
5.
LECB, LDCB are Suppl.
4. Ls have = mias;
5. adj. Ls w. ext. sides opp, rays
4.
6. m LECB t m LD CB =180
7 m LECB3M LECAT mel
aresuppl; pret.
6. Sum of meen. of uppl. s is
80;5
mees.
1. Angle add. pests pict
8. MCECA + mU + m LDCB = 180
9.
8. Sube titution, Gi?
9. substitation;4,8
+ m2i tmLB =180
eop.
LD

CW 19 - 3/11
Civen: AD IDC, BC LDC
love: AD l BC
2.3
#19

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