Question

What is a straight angle?

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

Answer 1

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

A straight angle is formed by two rays that are exactly opposite, starting from a single vertex.

The included angle between such rays is ${180}^o.$
Hence, a straight angle is ${180}^o.$

Example: The angle between East and West is a straight angle.