Which statement represents the biconditional statement of the conditional statements? If an angle measures 90º, then the angle is right.
If an angle is right, then the angle measures 90º

1) An angle measures 90º if and only if the angle is right.
2) An angle does not measure 90º if and only if the angle is right.
3) An angle does not measure 90º if and only if the angle is not right.
4) An angle measures 90º if and only if the angle is not right.