Simson's line

Autor:Terry Tam

P is a point on a circle, and ABC is an inscribed triangle. Prove that the feets of altitudes of point P on 3 sides of the triangle are collinear. (Hint: Consider PABC as a cyclic quadrilateral)

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Tetrahedron String Art
Average Value
רישום חופשי
兩位數的位值
Area Between Two Curves

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Statistical analysis of Y9 data
horizontal shot
locus_1
สามเหลี่ยมพีทาโกรัส
四角錐體切面

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