Question

Determine which of the following pairs of angles are co-terminal

• A. ${210}^0,-{150}^0$
• B. ${330}^0,-{60}^0$
• C. ${405}^0,-{675}^0$
• D. ${1230}^0,-{930}^0$

Answer 1

The correct option is A ${210}^0,-{150}^0$

Coterminal angles are the one who shares the same initial side and terminal side (see the figure)

They can be found by adding or subtracting 360 degrees

In option 'A' ;$-{150}^{\circ }$ can be obtained by subtracting ${360}^{\circ }$ from ${210}^{\circ }$