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math

Across
a straight line from the center to the circumference of a circle or sphere
a straight line segment whose endpoints both lie on the circle.
an arc of a circle having measure less than or equal to ( radians).
a round plane figure whose boundary (the circumference) consists of points equidistant from a fixed point (the center).
A tangent line is a line that intersects a circle at one point.
A=πr2
an arc of a circle having measure greater than or equal to ( radians).
the angle that forms when two radii meet at the center of a circle.
Down
a one-dimensional locus of points that forms half of a circle.
the angle formed in the interior of a circle when two secant lines (or, in a degenerate case, when one secant line and one tangent line of that circle) intersect on the circle.
to a plane curve at a given point is the straight line that "just touches" the curve at that point.
C=2πr
straight line segment that passes through the center of the circle and whose endpoints lie on the circle.
a line that intersects the curve in at least two (distinct) points.
a closed segment of a differentiable curve.