If D is the number of degrees and R is the number of radians in an angle θ

• Quant Trigo

If D is the number of degrees and R is the number of radians in an angle θ, then which one of the following is correct?

1. πD = 180R
2. πD = 90R
3. πR = 180D
4. πR = 90D

Answer

The relation between the degrees and radians is

π radians = 180 degrees

πR = 180D

For example, 90° = π/2

The correct option is C.