Answer:
It's a right triangle
Step-by-step explanation:
For a ≤ b ≤ c:
if a² + b² = c², then a triangle is a right triangle
if a² + b² < c², then a triangle is an obtuse triangle
if a² + b² > c², then a triangle is an acute triangle.
We have a = 18, b = 24, c = 30. Substitute:
18² + 24² = 324 + 576 = 900
30² = 900
18² + 24² = 30² → a² + b² = c²
