5, 12, and 13 units, then a triangle with sides 10, 24, and 26 is also a right triangle.

True, because multiples of a right triangle triple produces a similar right triangle with congruent angles.

False, because doubling the sides of the triangle does not keep the angles congruent

False, because a triangle with sides 10, 24, and 26 is not a right triangle according to the Pythagorean theorem.