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This is a segment of a circle.The straight line is a chord.The curved line is an arc.
a circle
A semicircle is one shape fitting this description.
Well, if you think about it, a baseball diamond fits the description perfectly!
A vertical line
Irregular shape is the term given to an object which has 1 flat side, 1 curved side, no corners but has curved edges.
A cylinder.
This is a segment of a circle.The straight line is a chord.The curved line is an arc.
sphere
Any curved shape such as a circle, an ellipse, an oval, a wriggly line - as long as it does not have any corners.
a circle
A semicircle is one shape fitting this description.
A cylinder would fit the given description.
A cone
A line. Or a circle
A vertical line
A sphere