Determine whether the given lengths can be sides of a right triangle. which of the following are true statements? the lengths 7, 40 and 41 can be sides of a right triangle. the lengths 12, 16, and 20 cannot be sides of a right triangle. the lengths 7, 40 and 41 cannot be sides of a right triangle. the lengths 12, 16, and 20 cannot be sides of a right triangle. the lengths 7, 40 and 41 can be sides of a right triangle. the lengths 12, 16, and 20 can be sides of a right triangle. the lengths 7, 40 and 41 cannot be sides of a right triangle. the lengths 12, 16, and 20 can be sides of a right triangle.