Discussion
Sector at center of circle having an angle of 90° is called
Answer: A
A sector of \( 90^{\circ} \) is one quarter of the circle, and is called a quadrant.
Its area is \( \tfrac{1}{4}\pi r^{2} \) and its arc \( \tfrac{1}{2}\pi r \). Two perpendicular diameters divide a circle into four such quadrants.
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