円の面積・円周ラボ｜円周率を図で学ぶ

This is a math app for 5th graders to 1st year middle school students that allows them to learn about the area and circumference of a circle by moving and rearranging circles.

By dividing a circle into 8, 16, 32, and 64 equal parts and rearranging the sectors, shapes related to the area formula become apparent. You can also roll a circle to check its circumference and consider pi in relation to its diameter. Three practice problems and hints are also included.

This app can be used when you want to understand the formulas for the area of ​​a circle through movement and diagrams.