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Free Downloads -- Clip Art to pop into any Geometry quiz or worksheet for angle measures! Geometry with Roof Trusses - Clipart and worksheet for finding missing angle measures (practicing Angle Addition Postulate, Triangle Sum Theorem, Supplementary Angles.... ANY angle skill!) Just add your own text boxes to supply "given information" on a quiz or worksheet


FREEBIE! This activity helps students discover the angle sum property of triangles by cutting off the angles of a triangle and pasting the vertices together, which meet to form a straight line (180°).

from Teachers Pay Teachers

Interior & Exterior Angles of Triangles Matching Activity

This matching activity is a great way to have students practice finding unknown measures of interior and exterior angles of triangles. There are 12 problems students will solve and match up the answers to on the mat. Students need to apply the triangle sum theorem and also use supplementary and complementary angles to solve for the unknown measure. Teacher answer key included! Common Core Aligned: 8.G.5


This is a great discovery lesson for using the the sum of the interior angles of a triangle to figure out and apply the concept of the sum of the interior angles of other polygons. It is aligned with CCSS.5.G.B.4.