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Lesson Materials

Triangles


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Objective

6.13b The student will measure and draw right, acute, and obtuse angles and triangles.

 Directions Close 
  1. Drag points A, B, and C to change the side lengths and angle measures of your triangle.
  2. Construct a triangle with one right angle. What are the measurements of the other two angles? Can you make the other two angles measure the same? Classify this triangle by the lengths of the sides.
  3. Construct a triangle with one obtuse angle. What do you notice about the other two angles?
 Directions 2 Close 
  1. Construct a triangle with all angles of different measure. Classify this triangle by side lengths?
  2. Construct a triangle with all acute angles.
  3. Is it possible to construct a triangle with two obtuse angles?
  4. Construct a triangle with one 180 degree angle. What are the measurements of the other two angles? What is this called?

 Other Web Sites Close 

Classify Triangles

 Puzzles & Problems tangram Close 
From Math Forum:
  1. What is a reflex angle?
  2. What are explementary angles?
 Hands-On Activities Close 

Color the Triangles on-line