SOLUTION: Two isoscales triangles ABC and DBC are situated o opposite side of BC. Prove that AD bisects BC perpendicularly.

Question 1082649: Two isoscales triangles ABC and DBC are situated o opposite side of BC. Prove that AD bisects BC perpendicularly.
Answer by ikleyn(52847)   (Show Source): You can put this solution on YOUR website!
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The two triangles make a rhombis, and the diagonals of a rhombis are perpendicular.

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On properties of rhombis , see the lessons
    - Diagonals of a rhombus are perpendicular
    - Diagonals of a rhombus bisect its angles
in this site.

Also, you have this free of charge online textbook on Geometry
    GEOMETRY - YOUR ONLINE TEXTBOOK
in this site.

The referred lessons are the part if this textbook under the topic "Properties of rhombis".

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