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[" 13.The number of triangles which are ...

[" 13.The number of triangles which are obtuse and which "],[" have the points "(8,9),(8,16)" and "(20,25)" as the feet of "],[" perpendiculars drawn from the vertices on the opposite "],[" sides is "],[[" (a) "0," (b) "1],[" (c) "2," (d) "3]]

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