it means that part of the shape is rounded outwards
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congruent, convex, cirlce, circumfrence
A convex quadrilateral with two pair of equal adjacent sides.
principal(in terms of math)- the amount you borrow or deposit
It means sunken in. If the top of a stone is concave, it can hold rainwater.'Convex' means swollen out. If the top of a stone is convex, water rolls off.
A number? ^^