Answer:
Yes is a pythagorean triple
Step-by-step explanation:
To know if you can build a right triangle with those sides we have to make the following equality
h² = l1² + l2²
The hypotenuse is always the longest side so it should be 30
we check the equality of the equation
30² = 18² + 24²
900 = 324 + 576
900 = 900
Equality was fulfilled so it is a right triangle
