
Elementary Geometry For College Students, 7e
7th Edition
ISBN: 9781337614085
Author: Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher: Cengage,
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Question
Please help fill in the blanks of the two-column proof.
The proof is in the picture.

Transcribed Image Text:A.
C.
Given: D is the midpoint of BC of triangle ABC
Prove: EF//BC
E.

Transcribed Image Text:6.
Given: D is the midpoint of BC of triangle ABC
Prove: EF//BC
Statements
Reasons
1.D is the midpoint of side BC of triangle 1.Given
ABC and the bisectors of angles ADB
and ADC meet AB and AC at E and F
respectively
2.Triangle ABC = triangle AEF
2.lf two angles of one triangle are equal
respectively to two angles of another,
then the triangle are similar. (a.a.)
3.AE + EB = AB & AF+FC = AC
3.Segment Addition Postulate
4.Triangle BDE = triangle ADE & triangle
CDF = triangle ADF
4.Definition of angle bisector
5.AE/EB = AF/FC
5.Corresponding sides of similar
triangles are proportional (C.S.S.T.P.)
6.Angle ABD = angle AEF & angle BCA =
angle EFA
6.Corresponding Angles Postulate
7.DE bisects AB and DF bisects AC
proportionally
8.EF II BC
8. If a line divides two sides of a triangle
proportionally, then it is parallel to the
third side. (Theorem 54)
7.
5.
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