Teaching DSSSB TGT Mock Test 2025 Mathematics Triangles Circum-centre

The feet of the perpendicular from a point to the side of a triangle are collinear if and only if point lies on the circumcircle. The theorem is based on:

1
Ceva's Theorem
2
Lehmus Steiner Theorem
3
Ptolemy’s Theorem
4
Simson's line
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