Question

If a ray stands on a line, then sum of two adjacent angles so formed is:

• A. $0^o$
• B. ${90}^o$
• C. ${180}^o$
• D. ${360}^o$

Answer 1

The correct option is C ${180}^o$

Angle made by straight line is ${180}^o$. So, if a ray stands on a line the sum of two adjacent angle so formed is ${180}^o$. They are also called as linear pair of angles.