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Kelas 7 Matematika
Bab Bangun Datar

p = 5 + 2l

Keliling = 28
2 . (p + l) = 28
5 + 2l + l = 28/2
3l = 14 - 5
l = 9/3 cm
l = 3 cm

p = 5 + 2 . 3
p = 11 cm

Luas = p . l
Luas = 11 . 3
Luas = 33 cm²