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

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

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.

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

Let’s find the value of ∠AOP & ∠BOP if the measurement of AOP is more than ∠BOP by 140°.