Sum of the angles of a triangle
Students prove that the sum of the interior angles of a triangle is 180 degrees. Students are introduced to Geometer's Sketchpad through a demonstration then try their hand at proving the interior angle's measurement.
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Congruence, Proof, and Constructions
This amazingly extensive unit covers a wealth of geometric ground, ranging from constructions to angle properties, triangle theorems, rigid transformations, and fundamentals of formal proofs. Each of the almost-forty lessons is broken...
8th - 10th Math CCSS: Designed