Jawabanmu

2014-03-13T08:08:21+07:00
Α/360° = 22 / (2 x 22/7 x 7)
α/360 = 22 / 44
α = 1/2 x 360 = 180°

L juring / (22/7 x 49) = α/360
L j = 180/360 x 154 = 77 cm²
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