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## Investigate the sum of the angles in a triangle and a quadrilateral using various methods. 0606.4.1

1. Construction of Bicentric Quadrilateral - a mathematical droodle
2. Interactive Quadrilateral - drag the dots or
3. Practice With Quadrilaterals - a twelve question quiz with drawings
5. Quadrilateral Family - from regents prep
6. Quadrilateral Matching - concentration style quiz
7. Quadrilateral Quest - interactive lesson, drag and drop activity or
8. Quadrilateral Sorter - click on a shape to find out about it
9. Quadrilaterals Explained - from Math is Fun or
11. Quadrilaterals - a wikipedia entry with a large number of drawings
12. Shapes: Quadrilaterals - explanation and questions to show understanding
13. What's My Quadrilateral - three different teaching ideas

Triangles

1. Angle Classification: Acute, Right, Obtuse - explanation and questions to answer
2. Angles - Students practice their knowledge of acute, obtuse and alternate angles.
3. Angles - game to help recognize angles or
4. Basic Geometric Figures - a TAKS worksheet to print and use in class [This expired link is available through the Wayback Machine Internet Archive. If the page doesn't load quickly click on Impatient? at the bottom right of the page.]
5. Classifying Angles - multiple-choice quiz [5 questions]
6. Equilateral, Isosceles, and Scalene Triangles - choose the most restrictive term
7. Geometry Building Blocks: Classifying Angles - explanation and drawings
8. How Do We Measure Angles? - six page worksheet to print and use in class
9. Measuring Angles - use a virtual protractor
10. Measuring Angles - Practice lining up and reading a protractor while you measure a set of angles in a fun learning activity or
11. Names of Angles - definition and drawings of each type or
12. Making Triangles - investigating the Concept of Triangle and the Properties of Polygons (from NCTM)
13. Right, Acute, and Obtuse Angles - sort angles into appropriate containers or
14. Right, Acute, and Obtuse Angles - figures are shown, decide which is the proper angle
15. Squaring the Triangle - learn about how the Pythagorean Theorem works, through investigating the standard geometric proof. Parameters: Sizes of the legs of the triangle.
16. Triangle Calculator - Enter values three of the six sides and angles of the triangle and the other three values will be computed. The number of significant values entered will determine the number of significant figures in the results.
17. Triangle Explorer - Students learn about areas of triangles and about the Cartesian coordinate system through experimenting with triangles drawn on a grid.
18. Triangle Identification - type of triangle, given its angles - instruction and review, practice, and a quiz and
19. Triangle Identification - identify the triangle given its angles - instruction and review, practice, and a quiz and
20. Triangle Identification - identify the triangle given its number of sides - instruction and review, practice, and a quiz and
21. Triangles Side-By-Side - use geometric vocabulary to describe properties of triangles
22. Types of Angles - definitions, and drawings of each type
23. Virtual Protractor - ten online activities investigating angles or

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