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D1 = 50cm
DO = 1/2 D1 = 1/2 * 50 = 25cm
OC = 15 cm (Tripel Pythagoras 15-20-25)
D2 = 2OC = 2 X 15 = 30cm
Luas = 1/2 x d1 x d2 = 1/2 x 50 x 30 = 750 cm²