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Sagot :
Answer:
45 cm
Step-by-step explanation:
since perimeter of ABC is 42, you subtract 12 from 42 to give you 30, and since ABC is isosceles you divide 30 by 2 to give you 15 for AB and BC and because BDC is equilateral, 15, 15, 15 each side gives you 45 cm
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