Question

a triangle has two sides are 8 cm and 13 cm. what could be the length of the triangle's third side?

Answer 1

We can do it by using angle-sum property
The sum of threes angles in a triangle is 180 degree
8cm+13cm+x=180
21cm+x=180
x=159

Answer 2

we know that
in a traingle,
sum of two sides>third side

so,
third side of this traingle will two sides 8cm and 13cm will be greater than 13+8=21