Jawabanmu

2014-06-17T18:09:15+07:00
L. lingkaran : 3,14.  x^{2} r
1256 : 3,14 : r x r
400 : r x r
r  \sqrt{x} 400
r  : 20
d : 2r
d : 40 cm
nulis yg rapi jgn berantakan
yg ditanya diameter bukan jari2
oh..maaf,,
2014-06-17T20:05:21+07:00
L = pi x r^2
1256 = 3,14 x r^2
r^2 = 1256/3,14
r = \/400 = 20 cm
Diameter = 20 x 2 = 40 cm
2 2 2