Question

a triangle has a perimeter of 60cm . if two side are of length 18 cm and 22 cm. find the length of the third side​

Answer 1

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.

Answer 2

Answer:

$\huge\huge{20}$