This math topic focuses on the geometry of circle sectors, specifically calculating sector areas and deducing the radius and sector angle from given area equations. The problems are intermediate-level, aimed at reinforcing the relationships between a circle's radius, the central angle, and the area of a sector. Each question provides an equation for the sector's area and requires solving for the possible values of radius and angle that satisfy the equation, with multiple-choice answers available.
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If the area of a sector of a circle is given by this equation, what is the radius of the circle and the sector angle?