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segi tiga 1 : 1/2 X 9 X 5 :45/2:22.5cm2
Ada 2 segi tiga 1 jadi dikali 2
22.5 X 2 : 45cm2
segi tiga 2 : 1/2 X 8 X 10 : 40 cm2
ada 2 segi tiga 2 jadi dikali 2
40x 2 : 80cm2
Luas : 50+45+80 : 175 cm2