Try An Angle
Fifth graders build triangles with tangram pieces and then classify the different triangles by looking at their sides and angles.
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Supplementary, Complementary, and Vertical Angles
By using circles that they cut out and label themselves, learners literally "get a grip" on the angles they identify: supplementary, complementary, and vertical. They solve missing measurements based on properties of supplementary,...
4th - 6th Math CCSS: Adaptable