Find the least positive angle measurement that is coterminal with -20
a) 342
b) 340
c) 345
d) 350

The Option B). 340 is correct.

Step-by-step explanation:

Co-terminal angles : The angles who has same terminal or initial sides are known as terminal angles.

So, in order to find measure of co-terminal angles we add or subtract the complete angle of 360° formed at a point.

Now, the measure of an angle is given to be 20°

To find : Least positive Co-terminal angle of 20°

Since, we need to find least positive co-terminal angle we subtract 20° from 360°

Required co-terminal angle measure = 360° - 20°

Hence, measure of co-terminal angle of 20° = 340°

Therefore, Option B). 340 is correct.