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Keliling = 22/7 × 42 cm = 132 cm
Jarak yang ditempuh sepeda = 132 cm × 50 = 6600 cm = 66 meter
4. Pertama harus nyari keliling lintasan larimya dulu.
Kel = 22/7 × 56 m = 176 m
Banyak putaran = 550/176 × 1 putaran = 3 1/8 putaran
5.
a. Kel = (1/2 × 22/7 × 28 cm)+(1/2 × 22/7 ×14 cm)
= 44 cm + 22 cm = 66 cm
b. Kel = (1/2 × 22/7 × 28 cm) + (22/7 × 14 cm)
= 44 cm + 44 cm
= 88 cm
c. ??
6. Pertama harus nyari keliling stadion dulu.
Kel = 22/7 × 105 meter = 330 meter
Jika dipasang lampu tiap 33 meter, maka jumlah lampu yang dibutuhkan = 330 ÷ 33 = 10 lampu