Circle and π

Change the radius: the edge of a circle is always a bit more than 3 diameters. Circumference π × d and area π × r², with a calculator.

Secondaire 1 – Secondaire 2 15 minNo account · nothing is saved

Want to go further with a tutor?

Take the free assessment: we tell you where you stand and suggest a tutor who can also use these activities in sessions.

More activities to try

Adding fractions

Cut two bars into parts of the same size to find a common denominator, then add. Why we never add the denominators.

Equation balance

Keep the scale balanced to isolate x: add, subtract, multiply or divide on both sides at once.

Mean and median

Move the points on a dot plot and watch the mean and the median. Add an outlier and find out which of the two holds up better.