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Let x be the length of one of the congruent sides, then the three sides are x, x, 3x.

Perimeter = x + x + 3x

= 5x = 75cm

=> x = 15cm

Thus the three sides are 15cm, 15cm, 45cm.

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Q: If an isosceles triangle is a triangle with 2 congruent equal sides if the third side is three times the length of the congruent sides and the perimeter is 75cm find the length of all three sides?
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