Question

Two sides of a triangle are 10 cm and 12 cm.The perimeter of the triangle is 35 cm . What will be the length of the third side?

Answer 1

let x be the langth of the third side
peri. of triangle=sum of all three sides of triangle
35=10+12+x
35=22+x
35-22=x
therefore, x= 13cm

Answer 2

Two sides of the triangle are 10cm and 12cm
Also the perimeter of the triangle is 35cm
And perimeter = sum of all the sides

Let the third side be x

Thus,
10 + 12 + x = 35
22 + x = 35
x = 35 - 22
x = 13

Hence the third side of the triangle is 13cm


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