What is a Radian?

In this applet, you will explore a radian.

1. Use the slider to change the angle. How many radians are there in a full circle? 2. Does changing the radius (r) affect how many radians there are in a circle?

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Curves
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การบวกจำนวนเต็มบวกกับจำนวนเต็มลบ

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Cylinder