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Luas I = 43×39
Luas 2 = 1/2 × 39× 21
Rumus no.3
Luas I = 20×20
Luas 2 = 36×21
Luas 3 = 36+ 20 ×18
2
Rumus 4
Luas I= 30×20
Luas 2 = 49 + 19 × 31 : 2
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