27. LAED LBEC 28. AE + EC AC 2. 29. m L1 + m Z 2 = m LABC 30. If 22 = 23, then AD || BC. C 31. m LAEB = m L 2 + m ZC %3D 32. If DA 1 AB, then m L DAB = 90. 3. 33. m L1 + mZ 3 + m Z DAB = 180 34. If LABC is a right angle, then AB 1 BC.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter8: Applications Of Trigonometry
Section8.2: The Law Of Cosines
Problem 3E
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Concept explainers
Question

Name or state the postulate, definition, or theorem that
justifies each statement about the diagram.

27. LAED LBEC
28. AE + EC
AC
2.
29. m L1 + m Z 2 = m LABC
30. If 22 = 23, then AD || BC.
C
31. m LAEB = m L 2 + m ZC
%3D
32. If DA 1 AB, then m L DAB = 90.
3.
33. m L1 + mZ 3 + m Z DAB = 180
34. If LABC is a right angle, then AB 1 BC.
Transcribed Image Text:27. LAED LBEC 28. AE + EC AC 2. 29. m L1 + m Z 2 = m LABC 30. If 22 = 23, then AD || BC. C 31. m LAEB = m L 2 + m ZC %3D 32. If DA 1 AB, then m L DAB = 90. 3. 33. m L1 + mZ 3 + m Z DAB = 180 34. If LABC is a right angle, then AB 1 BC.
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