Final answer:
Congruent angles are angles of the same measure and can be any type of angle (acute, obtuse, or right), not just vertical angles as implied. The distinctive type of congruent angles in geometry is vertical angles. For projectile motion, the range is zero at 90° or 0° angles.
Step-by-step explanation:
If two angles are congruent, they are angles of equal measure. Congruent angles can be any type of angle depending on their specific measure. For example, they could be acute angles if they are both less than 90°, they could be obtuse angles if they are both more than 90° and less than 180°, or they could be right angles if they both measure exactly 90°. However, one type of angle that is always congruent with its pair by definition is vertical angles, which are pairs of opposite angles formed when two lines intersect.
As for the references to angles pointing in opposite directions or being perpendicular and forming a 270°, these characteristics do not describe congruent angles generally, but rather specific pairs of angles or relations in geometric figures.
Regarding the angle of a projectile, the range of a projectile is equal to zero when the angle is either straight upwards or not leaving the origin at all, which are at 90° (directly upward) or 0° (horizontal but with no motion in projectile scenarios).