Discussion
Sector at center of circle having an angle of 180° is called
Answer: A
A sector whose central angle is \( 180^{\circ} \) covers half the circle, bounded by a diameter and the arc - a semicircle.
Its area is \( \tfrac{1}{2}\pi r^{2} \) and its perimeter \( \pi r + 2r \), the arc plus the diameter.
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