Which if the following best describes a pair of angles that combine to form a straight angle.

a. vertical angles
b. supplementary angles
c. complementary angles
d. linear pair

The answer to this is B, because supplementary angles sum up to 180 degrees, which means it is a straight angle.

Option B and D

Step-by-step explanation:

Given are four options and we have to select the one which form a straight angle.

The given options are

A. Vertical Angles  ... Vertical angles are formed when two lines intersect and hence cannot combine to form a straight angle.  Incorrect option.

B. Supplementary Angles ... Supplementary angles are a pair of angles which add upto 180 degrees and hence they form a straight angle. Correct option

C. Complementary Angles  ... These pair add up to 90 degrees and cannot combine to form a straight angle.  ..  Incorrect

D. Linear Pair ... A linear pair is a pair of angles formed on a straight line and hence correct option.

answer:     true

step-by-step explanation: