C=πd
S=πr^2
by quanyidong @ 2024-09-20 19:14:15
2Πr
by huowenshuo @ 2024-09-20 19:14:18
$C = \pi d = 2\pi r$
$S=\pi r^2$
by _cbw @ 2024-09-20 19:14:43
@[cjy328](/user/1464752)
周长=圆周率×直径
面积=圆周率×半径×半径
by Iron_pickaxe @ 2024-09-20 19:27:17
@[cjy328](/user/1464752)
等你六年级就学辣！
by Iron_pickaxe @ 2024-09-20 19:28:51
S=π*r*r
by ZHOUZHEK @ 2024-09-20 19:31:36
我们五下学的
by wangrunyang @ 2024-09-20 19:35:43