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3.6 x 55
198 cm
b 100/360 x (22/7 x 17.5 x 17.5)
3.6 x 962.5
3465 cm²
sekian.
pb = 100/360 * (22/7*35)
pb = 5/18 * 110
pb = 30,56 cm
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b. luas juring
Lj = 100/360 * (22/7*35*35)
Lj = 5/18 * 3850
Lj = 1069,44 cm²