Prove Proposition 20 using a different construction. First, bisect one of the angles of the triangle. This will create two triangles. Then apply the exterior angle theorem to one of the two triangles.

Elementary Geometry For College Students, 7e
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ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
ChapterP: Preliminary Concepts
SectionP.CT: Test
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This is about Euclid's element. 

Prove Proposition 20 using a different construction. First, bisect one of the angles of the triangle. This will create two triangles. Then apply the exterior angle theorem to one of the two triangles.

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Could you at least read my question and see if you can help solve what I am asking? I know how to solve it as Euclid put it but that's not the homework question I have. I have to use Exterior angle theorem to solve it  

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