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Transcript
Teacher Key Geometry Properties of Shapes Triangles Name each triangle according to its angles. A. B. acute triangle C. right triangle obtuse triangle Name each triangle according to its side lengths. D. E. scalene triangle F. equilateral triangle isosceles triangle Word Bank Draw a triangle with more than 1 name. List the names. acute equilateral Names a. acute and equilateral b. right and isosceles © 2002 CompassLearning, Inc. Answers may vary. Two possible solutions are shown below. a. b. Triangles isosceles obtuse right scalene Activity 40832 40833 Teacher Key Geometry Properties of Shapes Triangles Divide each shape 1 time to form congruent triangles. Name the types of triangles created. Answers may vary. G. H. right or isosceles triangles I. right or scalene triangles right or scalene triangles Divide each shape to form 4 congruent triangles. Name the types of triangles created. J. K. right or isosceles triangles L. right or scalene triangles acute or equilateral triangles Can an equilateral triangle also be a right triangle? Explain your thinking. No, an equilateral triangle cannot be a right angle. In order for the sides of a triangle to be equal in length, the angles must also be equal. This results in 3 acute angles for an equilateral triangle. Note: An isosceles triangle may be a right triangle. © 2002 CompassLearning, Inc. Activity 40832 40833 Teacher Key Geometry Properties of Shapes Connections Today I learned: _________________________________________________________________________________ _________________________________________________________________________________ _________________________________________________________________________________ Explore Can an equilateral triangle also be an obtuse triangle? Can a scalene triangle also be an acute triangle? Discover the answers to these questions and more by using a few materials and completing the chart below. You will need plastic straws, yarn, scissors, and a ruler. Cut 3 pieces of yarn 24” long. Cut the plastics straws into the following lengths: 2”, 3”, 4”, 5”, 6”, 7”, and 8”. Make 3 sets in all. Using the straw pieces as sides of triangles, create triangles to help you complete the chart. Thread together 3 straws. Bring the ends of the yarn together to form a triangle. Place an O if both types of triangles can be made from the same straw pieces. Place an X if both triangles cannot be made. Acute Triangle Right Triangle Obtuse Triangle Equilateral Triangle O X X Isosceles Triangle O O O Scalene Triangle O O O © 2002 CompassLearning, Inc. Activity 40832 40833