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geometric mean

a/x = x/b x is in this position

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Pythagorean Triple

the lengths of three sides of a right triangle

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trigonometry

triangle measurement

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chord

a segment whose endpoints are on the circle

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secant

a line that contains a chord

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diameter

a chord that contains the center of the circle

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tangent

is a line in the plane of a circle that intersects the circle in exactly one point

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point of tangency

the point in which the tangent intersects the tangent

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sphere

with center O and radius r is the set of all points in space at a distance r from point O

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concentric circles

circles with the same center

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common tangent

a line that is tangent to each of two coplanar circles

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central angle of a circle

an angle whose vertex is the center of the circle

(equal thier arcs)

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minor arc

less than 180 degrees. (2 letters)

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major arc

> 180 degrees (3 letters)

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semicircle

= 180 degrees (3 letters0

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inscribed angle

an angle whose vertex is on the circle

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circle

set of all points in a plane at a given distance from a given point in that plane.

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tangent circles

coplanar circles that are tangent to the same line at the same point; can be internally or externally tangent

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adjacent arcs

arc that have exactly one point in common

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congruent arcs

arcs in the same or congruent circles that have equal measures

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