Question

A ray stands on a line, then the sum of the two adjacent angles so formed is ______.

• A. ${180}^{\circ }$
• B. ${90}^{\circ }$
• C. ${360}^{\circ }$
• D. ${270}^{\circ }$

Answer 1

The correct option is A ${180}^{\circ }$

If a ray stands on a line, then the sum of two adjacent angles so formed is equal to ${180}^{\circ }$ which is also known as a linear pair.