For two secants or tangents from an external point to a circle, the exterior angle equals half the difference of the intercepted arcs. Which statement is true?

For two secants or tangents from an external point to a circle, the exterior angle equals half the difference of the intercepted arcs. Which statement is true?

• A. Exterior angle equals half the difference of the measures of the intercepted arcs.
• B. Exterior angle equals the sum of the intercepted arcs.
• C. Exterior angle equals the average of the intercepted arcs.
• D. Exterior angle equals the difference of the measures of the intercepted arcs.

Answer: (A)