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K = 22/7 × 42
K = 132 cm
jarak yang ditempuh = 132 x 50
= 6600 cm = 66 meter
= 2 x x 21 =132 cm = 1,32m
panjang lintasan = 1,32 x 50 = 66m (b)
semoga bisa membantu...
jadikan yg terbaik ya :D