draw an isosceles triangle with two of its sides measuring 8 cm and 18 cm what would be the measure of its third side
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An isosceles triangle has two sides that are the same length, so the answer is already narrowed down to either 3 cm or 7 cm. Moreover, the sum of any two sides of a triangle added together has to be greater than the third side.
If you were to guess that the unknown side was 3 cm, you could not form a triangle because 3+3<7. This means that the third side would be 7 cm long.
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