Finding Missing Angles in Triangles. This activity will allow your students to practice angles sum in triangles using an appealing format. Students will also use their knowledge of complementary and supplementary angles while finding missing angles in triangles. This product contains two activities; each activity has its own answer key. Click here to follow me to receive notifications when I add new products. ****************************************************** You might also be interested in: Classification of Triangles by Their Sides and Angles. Ordered Pairs (Fractions and Decimals), 4 Quadrants of The Coordinate Plane. Rectangular Prisms Student Notes (ISN) and PowerPoint Presentation. Rectangular Prisms Task Cards. Volume of Rectangular Prisms Practice, Tired Activity. Ratios and Proportions: Verbal, Table and Graph Representations. Ratios Students Notes (ISN) Ratios and Proportions Task Cards Integers Division: ISN notes, practice with models and coloring page. Integers Addition: ISN notes, practice with models and coloring page. Integers Subtraction:ISN notes, practice with models and coloring page. Integers Multiplication: ISN notes, practice with models and coloring page.