Answered: /5. D is the midpoint of side BC of…

Elementary Geometry For College Students, 7e

7th Edition

ISBN:9781337614085

Author:Alexander, Daniel C.; Koeberlein, Geralyn M.

Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.

Chapter8: Areas Of Polygons And Circles

Section8.5: More Area Relationships In The Circle

Problem 9E

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Theorem 54=If a line divides two sides of a triangle proportionally, then it is parallel to the third side.

Please answer in a two-column proof-statements and reasons. **Also, it should have ONLY one given (statement).**

It is about lines proportional. The question is in the picture. *The question is completely clear, so please don't reject the question.*

/5. D is the midpoint of side BC of triangle
ABC and the bisectors of angles ADB
and ADC meet AB and AC at E and F
respectively.
Prove: EF is parallel to BC. (See Theo-
rem 54.)

Polygon with three sides, three angles, and three vertices. Based on the properties of each side, the types of triangles are scalene (triangle with three three different lengths and three different angles), isosceles (angle with two equal sides and two equal angles), and equilateral (three equal sides and three angles of 60°). The types of angles are acute (less than 90°); obtuse (greater than 90°); and right (90°).

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