Lines and Angles

If a ray stands on a line, then the sum of two adjacent angles so formed is:

If the sum of two adjacent angles is 180°, then the non-common arms of the angles form a:

If two lines intersect each other, then the vertically opposite angles are:

Lines which are parallel to the same line are:

If a transversal intersects two parallel lines, then each pair of corresponding angles is:

If a transversal intersects two parallel lines, then each pair of interior angles on the same side of the transversal is:

The sum of all the angles round a point is:

An angle is 20° more than its complement. The measure of the angle is:

If the supplement of an angle is three times its measure, then the angle is:

If two interior angles on the same side of a transversal intersecting two lines are in the ratio 2:3, then the smaller angle is: