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Bab Bangun Datar dan PerbandinganMatematika SD Kelas VI
13] Persegi panjang
Keliling = 30
2 x (p+ l) = 30
1 + l + l = 30 : 2
2l = 15 - 1
l = 14/2
l = 7 cm
p = l + 1
= 7 + 1
= 8 cm
luas = p x l
= 8 x 7
= 56 cm²
20] R = (2/3) S
R + 6 + S + 6 = 42
(2/3) S + S = 42 - 12
(5/2) S = 30
S = 30 x 2/5
S = 12 tahun
R = (2/3) x s
= (2/3) x 12
= 8 tahun
Selisih usia mereka = 12 + 8
= 4 tahun