Understand the relationships among the radius, diameter, circumference and area of a circle, and that the ratio of the circumference to the diameter is the same as the ratio of the area to the square of the radius, and that this ratio is called Pi. 0606.4.13

Links verified on 7/14/2014

- Animated Proof of the Pythagorean Theorem - The sum of the squares of the two sides adjacent to the right angle is always exactly equal to the square of the side opposite the right angle, the hypotenuse.-
- Calculating Areas - five multiple choice questions
- Calculating Pi - activity using string, meter stick and several types of cylindrical containers
- Circle, Sphere and Cylinder Calculator - input a number, state if the number is diameter, radius, or circumference and the other numbers are calculated
- Lesson on Circumference of a Circle -
examples and five practice exercises- The Magic Circle - activity using coffee can lids, string and rulers
- Measuring Around - find circumference - five multiple choice questions
- Pi - explanation from Wikipedia including an excellent animation at the top of the page
- The Pythagorean Theorem, Distance Formula and Intro to Trigonometry - other practice activities

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