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Enhance your classroom with critical-thinking problems correlated to the content of our textbooks. Nine of the thirty-six problems available are included here. Select a problem below and print it to use in class.

Chapter 1 The Supernova
The Moving Dominoes
The Shortest Distance

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Chapter 2 Miquel's Theorem
The Curious Cube
Aristotle's Wheel
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Chapter 3

A Domino Knot
The Extra Square

One Into Three

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Chapter 4

The Amazing Triangle
The Cuboctahedron

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Chapter 5 The Nine Puzzle
Are All Triangles Isosceles?
A Möbius Trisection
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Chapter 6

Square Assembly
T-Squares

Checks Into Stripes

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Chapter 7

The Divisible V
The Work Problem
A Logarithmic Spiral

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Chapter 8 Squaring a Greek Cross
Pythagoras Without Squares

A Square Proof
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Chapter 9 An Eight-Point Star
An Inscribed Circle
Circular Tangrams
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Chapter 10 The Nine-Part Triangle
The Two Crescents

A Construction for Pi
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Chapter 11 Planar Pentominoes
Pythagoras in 3-D
Truncated Polyhedra

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Chapter 12 The Intersecting Circles
The Gothic Window
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Chapter 13 The Titled Ellipse
Tessellated Polygons

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