Sayantani drew a straight line AB. I drew a ray PQ from a point P on AB. As a result two adjacent angles ∠PQB and ∠PQA are formed. Let’s write the measurement of angles ∠PQB and ∠PQA are formed. Let’s write the measurement of angles ∠PQB and ∠PQA and ∠PQB + ∠PQA by using protractor.

Lets define adjacent angles and write which pair of angles are adjacent from the following figures.

Let’s draw adjacent angles by using protractor whose measurements are given below.

35°, 45° ; 18°, 42° ; 32°, 90° ; 73°, 63°

Shakil draws two adjacent angles ∠ABC and ∠ABD whose sum of measurement is 180°; I also drew ∠ABC and ∠ABD like Shakil and examined whether point B,D and C lie on a same straight line or not.

Let’s find the value of x from the figure beside.