Answer all the questions below and press submit to see how many you got right.
Alternate exterior angle : When two parallel lines are crossed by a third line, alternate exterior angles are a pair of angles that are not between the two parallel lines and are on opposites sides of the crossing line. Alternate exterior angles are equal.
Alternate interior angle : When two parallel lines are crossed by a third line, alternate interior angles are a pair of angles that are between the two parallel lines and are on opposites sides of the crossing line. Alternate interior angles are equal.
Angle : If two line segments (or rays) both start at a common point the opening between the two line segments is called an angle. The common point is called vertex of the angle. The size of an angle is measured in degrees.
Line : A line AB is a one-dimensional shape that includes the points A and B, all the points on the line segment in between A and B and all the points of the straight extension of the line segment beyond A and B. A line does not have an endpoint.
Parallel : Two lines in a two-dimensional plane are called parallel if they never cross.
Straight angle : A straight angle is an angle equal to $180^{\circ}.$
Which statements are true about the angles $\alpha$ and $\beta$ at the crossings of the line EF with the parallel lines AB and CD in the picture above?