This is a worksheet to be used with my music video "What Makes A Triangle" on YouTube from my channel "mrsteffessongs" in which I sing about triangles. This would be a great homework or extra credit assignment or as an introduction to triangles at multiple grade levels or a review for Geometry. Answer key included.
The first section on the sheet has students fill in vocabulary words to complete definitions related to triangles using words that they hear in the video. The next sections are for either examples or practice. The first example section has students construct triangles with a ruler and protractor, given criteria of either side lengths or angles. One triangle is not possible (angle sum > 180 degrees) so students must explain why. The second example section has students measure angles and find the sum of them for three triangles and compare their results to the informal sum theorem. The last example section has students informally showing ASA, SAS, and SSS triangle congruence using rigid transformations by using tracing paper, then describing the transformations.