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S = 100/4= 25cm
D1 = 48CM
OC =1/2D1 = 48/2 =24cm
DO = 7 cm (triple pythagoras 7-24-25)
D2 = 2XDO = 2X7 =14 CM
Luas = 1/2 D1xD2 = 1/2 X 48 X14 = 336 cm²