Unit 6 Contents

Triangles

10. Use the Shape Sort Cards: Triangles pages in the Student Activity Book to make shapes with ordered pairs.

11. Cut apart the cards from the Sort Cards: Triangles pages. Sort the triangles into two groups: triangles with right angles and triangles without right angles.
1. Which triangles have right angles?
2. Which triangles do not have right angles?
3. What name do we give to triangles that have right angles?
4. What do you notice about the coordinates of the right triangles?
5. Mark said, “I think the shape on card 3 is a right triangle.” Do you agree with Mark? Why or why not?
12. Draw a different right triangle on one of the cards on the Blank Sort Cards pages in the Student Activity Book. List the coordinates and label the vertices.
13. Draw an obtuse triangle on one of the cards on the Blank Sort Cards pages. List the coordinates and label the vertices.
1. Sort the triangles into two groups again: this time triangles with at least one set of congruent or equal sides in one pile, and triangles without congruent sides in another pile.
2. Show or tell your neighbor how you decided which shapes have congruent sides.
3. Draw a triangle with at least two congruent sides on one of the cards on the Blank Sort Cards pages. List the coordinates and label the vertices.