Two lines are perpendicular if and only if they form right angles. express the given biconditional as the conjunction of two conditionals. a. if two lines are perpendicular, then they form right angles. if they form right angles, then the angle measures 90. b. if two lines are perpendicular, then they form right angles. if they form right angles, then they are perpendicular. c. if the angle formed by two lines measures 90, then the lines form right angles. if they form right angles, then the angle measures 90. d. if two lines are perpendicular, then the angle measures 90 if they form right angles, then the angle measures 90.

Write the contrapositive of the conditional statement. determine whether the contrapositive is true or false. if it is false, find a counterexample. a converse statement is formed by exchanging the hypothesis and conclusion of the conditional. a) a non-converse statement is not formed by exchanging the hypothesis and conclusion of the conditional. true b) a statement not formed by exchanging the hypothesis and conclusion of the conditional is a converse statement. false; an inverse statement is not formed by exchanging the hypothesis and conclusion of the conditional. c) a non-converse statement is formed by exchanging the hypothesis and conclusion of the conditional. false; an inverse statement is formed by negating both the hypothesis and conclusion of the conditional. d) a statement not formed by exchanging the hypothesis and conclusion of the conditional is not a converse statement. true