## TrianglesThese books provide a thorough and enjoyable introduction to math. The reader is encouraged to discover basic concepts through a combination of investigation, hands-on activity and theory. In many cases these activities are based on practical projects; in others the reader is encouraged to develop problem-solving strategies. |

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### Contents

Making Triangles | 7 |

Odd One Out | 14 |

Kinds of Triangles | 20 |

Copyright | |

5 other sections not shown

### Common terms and phrases

90 degrees acute-angled triangles angle required angle Answers to drawing calculate the third circumference colored pencils diagram diameter different triangles draw a labeled draw a line draw a triangle Draw another square draw the triangle equal angles equal sides happyhound Impossible Triangles interior angles joining the centers Keep your drawings kind of triangle knot know the lengths labeled sketch large square Length of longest Length of middle Length of shortest less than 90 longest side Triangle mark three points measure the three middle side need them later number of triangles obtuse-angled triangle parallel lines point of intersection protractor quarter turn required angle required rhombus right-angled triangle ruler and pencil scalene triangle set square shortest side side Triangle Yes/No six folds square to check straight line third angle three angles three sides thumbtacks total 180 degrees triangle ABC triangle and fit Triangle EFG triangle total 180 Try to draw vertex