Curated OER
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,...
Curated OER
Find the unknown angle in the following triangles
In this unknown angle activity, students find the unknown angle in the triangle that gives them 2 angles. Students find 9 unknown angles.