Understanding Angles on a Straight Line

The video explains that the angles on one side of a straight line always add up to 180 degrees. When a line is split into two angles and one angle is known, the other can be calculated by subtracting the known angle from 180 degrees. An example is provided where one angle is 40 degrees, and the other is calculated to be 140 degrees.

What is the total sum of angles on one side of a straight line?

• 270 degrees

• 90 degrees

• 180 degrees

• 360 degrees

If a straight line is divided into two angles, and one angle is known, what can be said about the other angle?

• It is always 45 degrees.

• It can be calculated by subtracting the known angle from 180 degrees.

• It is equal to the known angle.

• It is always 90 degrees.

If one angle on a straight line is 40 degrees, what is the measure of the other angle?

• 140 degrees

• 180 degrees

• 100 degrees

• 40 degrees

What is the measure of angle A if the other angle on the straight line is 40 degrees?

• 90 degrees

• 180 degrees

• 140 degrees

• 40 degrees

In the example given, what is the sum of the two angles on the straight line?

• 220 degrees

• 180 degrees

• 140 degrees

• 90 degrees