Complementary
45 and 90 degree angles
two straight angles
They have one 90 degree angle and two 45 degree angles
Two angles are called suplementary angles if they form a straight angle, that is to say 180 degrees.
Two lines but they can't be parallel. It would be better to say two rays that share the same endpoint form an angle. However, two intersecting lines form angles also. Two rays can form a 180 degree angle if they share the same endpoint and point in exactly the opposite directions. Two perpendicular lines can form a right or 90 degree angle.
Two 90 degree angles create a perpendicular angle. A 60 degree angle and 120 degree angle also create a 180 degree sum.
180 Degree.
You'll also need a protractor to construct a 220 degree angle which can then be bisected by means of a compass and a straight line to form two 110 degree angles.
If you bisect a 30 degree angle, you end up with two 15 degree angles.
Any two angles whose sum is equal to 90 degrees are called "complementary angles".
A right angle triangle has one 90 degree angle and two acute angles