Complementary Supplementary and Vertical Angles

Upright Angles & Complementary Angles: Definitions & Examples - Video & Lesson Transcript

Specially designed angles make your daily routine much simpler. Find out how you can use the features of specific angles to find the missed angle measurement in this tutorial. Once you have finished this tutorial, you can find the measurement for missed angles if you know that you are viewing one of these particular angles:

Then you will learnt the one thing that identifies each kind of angles that you will use to help you. The first of our specific types of angles is referred to as a vertical one. They are angles that face each other when you have two crossing outlines. You have four angles at this point of intersection. What do you mean?

Characteristic of this particular kind of angles is that each couple of opposite angles is the same. You' ve got two sets of opposite angles. Suppose your two strokes make an x. If the upper corner is 35 degree, the lower corner opposite the upper corner will also be 35 degree.

The opposite corner is 145 degree if the right one is 145 degree. A further characteristic of vertical angles is that adjacent angles are additional angles, i.e. they sum up to 180-degree. So if an angel is 35 degree, then the angel running directly to the right or right is 145 degree, since 35 + 145 is 180.

In order to use the identification properties of vertical angles, you only need to know the measure of the opposite angles to the missed one. So if your absent corner is the lower corner, you just need to know how to measure the upper corner. When the upper corner is 60, then it is also the lower corner.

However, if you get the reading of the LH instead of the top bracket, you must use the second vertical bracket feature. If, for example, you are told that the vertical is 80 and you want to find the upper angular reading, you need to find out which angular reading results in the two angles of 180.

Now, you deduct the 80 from the 180 to determine that your upper angular is 100º.