Lines and Angles

What is the sum of the angles on a straight line?

If two lines intersect, what is the sum of the vertically opposite angles?

Two lines are said to be parallel if:

If a transversal intersects two parallel lines, the alternate interior angles are:

In triangle ABC, if angle A = 50° and angle B = 60°, what is angle C?

If two parallel lines are cut by a transversal, then the sum of the interior angles on the same side of the transversal is:

In the figure, if two lines are intersected by a transversal and one of the corresponding angles is 75°, what is the measure of the other corresponding angle?

If the sum of two adjacent angles is 180°, then these angles are called:

The measure of each exterior angle of a regular polygon is 30°. How many sides does the polygon have?

If two lines intersect and one of the angles formed is (3x + 10)° and its vertically opposite angle is (5x - 30)°, find the value of x.