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= √(3 x 1256 : 3,14 x 12)
= √(3768 : 37,68)
= √100
= 10
t=12 cm
la=3v/t
=3.1256/12
=314
la=π.r²
314=3.14.r²
r²=314/3,14
r²=100
jari jari nya adalah
10