Triange inside of a circle

Triangle inside of a circle

Draw perpendicular bisectors to each side of a triangle. This way you get intersect which is center point of a circle that seals in the original triangle.

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Circle inside of a triangle

Circle inside of a triangle

Circle can be drawn inside of a triangle. Centerpoint of a circle is intersect of angle bisectors.

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Central angle and inscribed angle

Central angle and inscribed angle of a circle

Can you find out what is the relationship between central angle and inscribed angle of a circle.

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Pi

What is pi? Why is it approximately 3.14?

This small applet demonstrates circumference of a circle with diameter 1.

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