Example: Volume of a cylinder

Let us create an essential question asking to calculate a cylinder's volume given its base's radius and height.

The Basic Mode allows us to retrieve a random integer number in a given interval. We need two random numbers: on for the base's radius and one for the cylinder's height, which we will call r, and h (the name of the variables is essential, as we will see later on). We need to click on the Add variable button to add them.

Now, we need to define the correct answer in the corresponding input field, considering that it's not a number. As you may see, the evaluate() command will be automatically displayed there to be used if we want our solution to be computed.

If we directly write the correct answer without the evaluate() command, the result showed to the student as the expected answer will appear without any performed calculus. Both options are valid, but we prefer to display the final fraction when the students answer the question in this example. Conversely, that's what it would be displayed.

Finally, we can test the question's behaviour in the Test the question section. There, we can try some possible answers and check everything works as expected.