Learn with Mentor · 8 min
Circles, Semicircles and Quarter Circles
Find the area and perimeter of semicircles and quarter circles, remembering that perimeter includes the straight edges as well as the curved edge.
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A slice of a circle
A semicircle is half a circle; a quarter circle is one quarter of a circle. Their area formulae are simply a fraction of the full circle's area formula (π × r²).