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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探究由平行線和截線所成的角
Shade a spheric triangle with "surface".
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bearing HK

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sine function with phase shift (angular measure)

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