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2.
L= π.r.s
1.582,56=3,14 x 12 x s
s= 1.582,56 / 36,158
s= 43,7679..
3.
L=4πr²
452.16=4 x 3,14 x r²
r²= 452.16/12,52
r²=36,1150 =] 36
r=√36 = 6
diameter= 2 x r = 2x6= 12
jadi diameter bola tersebut adalah 12