I nailed it Mr. Nelson #11

Author:nelsone

The altitudes of any triangle meet at a single point called the ORTHOCENTER. (An altitude is the perpendicular line segment from a vertex of a triangle to the opposite side of the vertex.)

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Proving Triangles Congruent (2): Multi-Step Transformations
Constructing the Perpendicular Line Through a Point Not on the Line
גיליון אלקטרוני להעלאת נתוני בעיה ויצירת גרף בהתאם
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Section quelconque d'un cylindre
Feuerbach's 1822 theorem for any triangle
TM 1 D Lee
Solving Equations with Variables on Both Sides
สี่เหลี่ยมมุมฉาก

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Cuboid
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