Question
In Fig., A, B, C and D are four points, and no three points are collinear. AC and BD intersect at O. There are eight triangles that you can observe. Name all the triangles.
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Answer
$\triangle A B C, \triangle A B D, \triangle A B O, \triangle B C O, \triangle D C O, \triangle A O D, \triangle A C D, \triangle B C D$
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