Answer:
no, yes, no
Step-by-step explanation:
If a triangle is a right triangle, it satisfies Pythagorean theorem:
c² = a² + b²
where c is the hypotenuse (longest side) and a and b are the legs.
12² = 4² + 9²
144 = 16 + 81
144 = 97
Not a right triangle.
25² = 7² + 24²
625 = 49 + 576
625 = 625
This is a right triangle.
32² = 16² + 30²
1024 = 256 + 900
1024 = 1156
Not a right triangle.
