the lengths of two sides of a triangle are 60cm and 90cm between what to measure the length of the 3rd side fall
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This is one of the oldest questions in the book, which involves simple algebra. The perimeter is the sum of all the lengths of all the sides of the shape. For this particular case, we can let the unknown length of the third side be x. Therefore applying the above-stated rule, we will be left with the equation, x+18+20=60. From here on, it's just a simple algebra problem. You add the 18 and 20(you get 38). You subtract 38 from both sides end up with x on the left, and a 22 on the other. Therefore, the length of the third side is 22 cm(remember the unit is exceedingly important.
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