Educational toolkit and toolbox:

Critical and innovative thinking skills workshop worksheet

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with the authors. It does not necessarily reflect the opinion of the European Union.

What is the circumference of the ball?

Measure as accurately as possible the circumference of the ball, using the tools provided:

A bucket with water

The bucket is marked to indicate the volume of its content.

The ball fits in the bucket.

A flashlight

Two triangle meters

The meters’ height is less than the ball

A piece of string

The string is shorter than the circumference of the ball

Write the ways you thought of using to measure the circumference. Then decide which way you believe is the optimum.