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Matematika kelas VII, Bangun datar.d1 : d2 = 3 : 4
Keliling = 20 cm
Sisi = 20/4 = 5
Maka cari phytagoras 5 maka pasangan segitinganya 3 dan 4
1/2d1 = 3
d1 = 3 × 2 = 6 cm
1/2d2 = 4
d2 = 4 × 2 = 8 cm
Luas = d1 × d2/2
= 6 × 8 /2
= 24