Students are guided to calculate various scale factors between corresponding sides of similar figures and calculate the length of a missing sides. Special attention is giving to the bridging from working on the figures to working on a formal
Students discover that the interior angles of a triangle add to 180 degrees, and then apply this principle to other polygons. The main versions focus on triangles and quadrilaterals, while the advanced version pushes students to develop a formula
Students explore how simplifying the ratio of short:long sides can identify similar figures and find unknown sides lengths.
This lesson is provided in three scaffolded versions: standard (s), hints (h), and (a) advanced to be differentiated within
Students practice using a protractor to measure angles with various orientations, using an answer bank to build confidence. Then, students learn how knowing 45, 90, 135 and 180 degree angles can help them visually estimate the measure of an angle.
*NOTE: This lesson is dependent on a classroom set of "polystrips" and "fasteners" that students use while attempting to build triangles of various side measures.
Students discover that that not just any 3 side lengths can make a unique
2 lessons in 1! 15 pages!
Students discover the logic behind complementary, supplementary, and vertical angles, and are prompted to use each vocabulary word and apply each concept.
The standard track uses one lesson to introduce the vocabulary