Jawabanmu

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2014-01-25T19:37:10+07:00
1256 m² = 3.14 × r²
r²  = 1256 ÷ 3.14
r² = 400
r = √400 = 20 m
2 5 2
2014-01-25T19:39:58+07:00
L= \pi x r  r^{2}
1256 =3,14 x  r^{2}
1256÷3,14 = r^{2}
400=  r^{2}
 \sqrt{400} = r
20 m = r
1 5 1