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A Triangle's Angles
Author:
Lndsay Flanagan
,
Steve Kifowit
The sum of the measures of the interior angles of any triangle is 180°.
GeoGebra
New Resources
Slope of a Straight Line: Run and Rise
Piano. Keyboard.
"Compressed" Astroid as Envelope
Play C3 E3 G3 C4_C4
Rotating Points (Optical Illusion)
Discover Resources
Rolling circle around circle
小數的認識
CCSS High School: Geometry (Challenges)
Untitled
Solving Equations in Parallel lines
Discover Topics
Hyperbola
Pie Chart or Circle Chart
Congruence
Dilation
General Quadrilateral