Raíz cuadrada de 100 es un numero

In triangle abc segment de is parallel to the side ac . (the endpoints of segment de lie on the sides ab and bc respectively). find de, if ac=20cm, ab=17cm, and bd=11.9cm;

Table which ratio is equivalent to 3: 7? 6: 7 3: 21 24: 56 15: 30

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