In the figure, a regular polygon is inscribed in a circle with center R. R S is perpendicular to K L. Find the measure of a central angle.
Choices:
A:30
B:60
C:90
D:120
Please directly answer the question and provide the correct option letter, e.g., A, B, C, D.
Question: In the figure, a regular polygon is inscribed in a circle with center R. R S is perpendicular to K L. Find the measure of a central angle.
Choices:
A:30
B:60
C:90
D:120
Please first conduct reasoning, and then answer the question and provide the correct option letter, e.g., A, B, C, D, at the end.
Question: In the figure, a regular polygon is inscribed in a circle with center R. R S is perpendicular to K L. Find the measure of a central angle.
Choices:
A:30
B:60
C:90
D:120