Polygon Playground · Pi Day

From polygon to circle · Liu Hui & Zu Chongzhi · π factory

sides n = 6

number of sides

6

●

scale 1.0

key numbers & records

sides n	π approx	error

π challenges · Pi Day

beginner

intermediate

advanced

π is approximately?

A. 2.718

B. 3.14159

C. 1.414

D. 3.333

π approx from Liu Hui's 192-gon?

A. 3.14

B. 3.1410

C. 3.141024

D. 3.142

Zu Chongzhi's π precision (decimal places)?

A. 5

B. 7

C. 9

D. 3

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