This question is an example of a multiple choice question.

In a multiple choice question, you select one or more possible answers from a list of choices. This means that your answer to the question must be at least partially correct.

The answer to this question is B. The angle between p and q is 135 degrees and the angle between q and r is 45 degrees. Thus, each of these angles must be greater than 0 degrees but less than 90 degrees. This eliminates choices A and C because they both contain angles greater than 90 degrees. Choice D is also incorrect because it contains an angle less than 90 degrees (in fact, it contains two angles less than 90 degrees).

OR

The angles of a triangle add up to 180 degrees. So, the sum of the angles of pqr is 5+20+40=85°.

The angle sum of a triangle is always 180°. So, if you know the three angles in a triangle, you can find all other angles.

In this example we want to find the angle at B and C. Since A is opposite B, we can use this formula:

angle at B = (180 – 20) / 2 = 90 / 2 = 45°

Last modified: September 5, 2022