If two sides of a triangle are 8 cm and 6 cm and its perimeter is 26 cm. Find the third side of the triangle.
12cm
Perimeter = a +b +c (i.e. the sum of length of all the sides)
⇒ Third side = 26 - 8 - 6
= 26 - (8+6)
= 26 - 14
=12
Third side = 12 cm