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Sagot :
Answer:
7.5
Step-by-step explanation:
triangle ABC and XBY are similar so the sides are in proportion
BX /BY = BA /BC
4/6 = 5/BC; cross multiply
4*BC = 5*6 ; divide both sides by 4
BC= 5*6/ 4 = 30 /4 = 7.5
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