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LP = 3,14 * 10 dm(10 dm + 5 dm)
LP = 31,4 dm (15 dm)
LP = 471 dm^2
Jawaban: B
22. K = (π d) + (5 cm * 4) + (18 cm * 2)
K = (22/7 * 7 cm) + 20 cm + 36 cm
K = 22 cm + 20 cm + 36 cm
K = 78 cm
Jawaban: D