Answer:
false
Step-by-step explanation:
in order for it to form a triangle, the two smaller sides must add up to be bigger than the bigger sides
5+7 > 10, 12 > 10 so it is a triangle
to see if it is a right triangle you must use c^2 = a^2+b^2
100 = 25 + 49
100 = 74
not a right triangle
