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How good are you at math? Do you think you're good? Well then answer these questions.

1) What is the equation for the circumference of a circle?

2) What is the value of pi?

3) Why is pi the value that you gave?

If you are having trouble answering these questions, then you need the PI Wheel. The PI Wheel helps you define and understand the circumference of a circle. And it explains how the value of pi is obtained.

Click on the picture for the answers to the questions and to see how the PI Wheel works.

Here are some more challenging questions.

1) What does the sin function tell you?

2) What does the cosine function tell you?

3) What does the tangent function tell you?

4) Can you tell me the values of sin, cos and tan for an angle without looking at a chart, table or calculator?

If you are not able to answer all of the above, then you need the Cos-Sin calculator. It is a device that teaches how trigonometric functions are derived. It's a teacher's delight when it comes to teaching trigonometric concepts.

What common variable is used to form relationships between the following?

1) The arc length to the circumference of a circle

2) The sector to the area of a circle

3) The slice to a cylinder

Having trouble answering the above. Then you need the Cylinder Calculator.

Need a hands on device to teach concepts. Then the cylinder calculator is for you. It is a device that teaches the equations for arcs, circles, sectors, cylinders, slices and areas. It allows students to visualize concepts instead of just remembering equations. 

Click on the picture for the answers to the questions and to see how the Cylinder Calculator works.