Cut a circle into a rectangle and prove the formula yourself
What you needTwo paper circles of the same size, a compass, a protractor, scissors and glue.
MethodCut one circle into 8 sectors of 45 degrees, lay them alternately up and down and glue them. Then do the same with 16 sectors of 22.5 degrees underneath.
Then measureMeasure the height and length of each shape. Compare the height with the radius, and the length with half the circumference.
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