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tutup botol = 6,28 cm²
banyak tutup botol yang dapa dibuat = 14400 cm² ÷ 6,28 cm²
= 2292,9 tutup botol
11. keliling persegi panjang = 2× (panjang + lebar) = 2 × (110 m + 60 m)
= 2 × 170 m = 340 m
keliling dua setengah lingkaran = 3,14 × 60 m = 188,4 m
A. keliling lapangan = 340 + 188,4 = 528,5 m
B. biaya : 528,5 ×30.000 = Rp.15.855.000
12. luas setengah lingkaran = 1/2 × 3,14 × 60m × 60m =
= 1/2 × 3,14 × 3.600m
= 1/2 × 11.304= 5.652
perbandiangannya = 5.652 : 5.652 = 1 : 1