Kunci Jawaban
1. b
Cari keliling roda terlebih dahulu
K = 2 x π x r
= 2 x 22/7 x 28
= 176 cm
Panjang lintasan = Keliling roda x jumlah putaran roda
= 176 x 400
=70.400 cm
=704 m
2. a
Cari keliling taman
K = 2 x π x r
= 2 x 22/7 x 7
= 44 m
Banyak tiang = Keliling : jarak antar tiang lampu
= 44 : 4
= 11
Biaya = jumlah tiang lampu x biaya 1 tiang lampu
= 11 x Rp200.000
= Rp2.200.000
= Rp2,2 juta