A cylinder
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A cylinder has one closed "cylindrical" (circular) surface and two circles at each end. ======================
french curve is used to connect arce and semi-circles, such as the neckline, armholes , and collar. it is either made of flat metal or wood.
A cylinder has two circles as its bases.
Circles, parabolas, ellipses, and hyperbolas are all conic sections. Out of these conic sections, the circle and ellipse are the ones which define a closed curve.
Are congruent circles.