(1) The given statement is false.
The true statement is: An angle in a semi-circular region is a right angle.
(2) The given statement is false.
The true statement is: An angle in a minor segment of a circle is an obtuse angle.
(3) The given statement is false.
The true statement is: An angle in a major segment of a circle is an acute angle.
(4) True, angles in the same segment of a circle are congruent.