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Oriented Triangle Angles
Drag a vertex across an edge to invert the orientation of the triangle. The angle measures give the counterclockwise rotations needed to align adjacent edges. The sum of the interior angles is always 180°, but the sum of the exterior angles is 900°.
Contributed by:
Michael Schreiber
THINGS TO TRY
Drag Locators
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SNAPSHOTS
RELATED LINKS
Angle
(
Wolfram
MathWorld
)
Triangle
(
Wolfram
MathWorld
)
PERMANENT CITATION
"
Oriented Triangle Angles
" from
the Wolfram Demonstrations Project
http://demonstrations.wolfram.com/OrientedTriangleAngles/
Contributed by:
Michael Schreiber
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Related Topics
Plane Geometry
Triangles
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Related Curriculum Standards
US Common Core State Standards, Mathematics
8.G.A.5
HSG-CO.C.10