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Cavalieri’s principle
If two solids are cut into cross sections by parallel planes, and the corresponding cross sections on each plane always have equal areas, then the two solids have the same volume.
central angle
The angle formed by the two radii to the endpoints of an arc.
chord
A chord of a circle is a line segment both of whose endpoints are on the circle.
circumcenter
The circumcenter of a triangle is the intersection of all three perpendicular bisectors of the sides. It is the center of the circumscribed circle.
circumscribed circle
The circumscribed circle of a triangle is the circle that passes through all three vertices. Its center is the circumcenter.
complementary
Two angles are complementary to each other if their measures add up to . The two acute angles in a right triangle are complementary to each other.
conditional probability
The probability that one event occurs under the condition that another event occurs.
congruent
One Rgure is called congruent to another Rgure if there is a sequence of translations, rotations, and reSections that takes the Rrst Rgure onto the second.
conjecture
A reasonable guess that you are trying to either prove or disprove.
converse
The converse of an if-then statement is the statement that interchanges the hypothesis and the conclusion. For example, the converse of "if it's Tuesday, then this must be Belgium" is "if this is Belgium, then it must be Tuesday."
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