Abstract

What is a ball?/How many faces does a soccer ball have?/What does the cut surface of a grapefruit look like?/Is the perspective mathematics, too?/To divide a square cake into five equal parts!/To measure areas on the map/To measure your weight/To measure the size of the earth/The golden ratio and the silver ratio etc.---Let's enjoy the familiar fun of mathematics by looking at photographs and figures and through actual works!

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