Question

Which three lengths could be the lengths of the sides of triangle ?

11cm , 11cm , 24 cm

18cm , 12cm , 9cm

9cm , 19cm , 10cm

4cm , 7cm , 23cm

Answer 1

18cm , 12cm , 9cm

Explanation:

Any two side lengths of a triangle added together must be bigger than the third side length and the difference between the two side lengths of a triangle must be smaller than the third side length.

18 + 12 is bigger than 9 and 18 - 12 is smaller than 9

same goes for

12 + 9 > 18 and 12 - 9 < 18