Concept explainers
a. On a blank piece of paper, draw a ray with endpoint A. Carefully fold your paper to create a fold line that makes a 90° angle with your ray at A. Briefly describe your method, and explain why it makes sense.
b. On a biank piece of paper, draw a ray with endpoint B. Carefully fold your paper to create a fold line that makes a 45° angle with your ray at B. Briefly describe your method, and explain why it makes sense.
c. On a blank piece of paper, draw a ray with endpoint C. Carefully fold your paper to create a fold line that makes a 22.5° angle with your ray at C. Briefly describe your method, and explain why it makes sense.
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Mathematics for Elementary Teachers with Activities, Loose-Leaf Version Plus MyLab Math -- Access Card Package (5th Edition)
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