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Geometry Vocab ch. 5
n/a
19
Mathematics
9th Grade
01/17/2011

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Cards

Term
altitude of a triangle
Definition
a perpendicular segment from a vertex to the line containing the side opposite that vertex.
Term
centroid
Definition
the centroid of a triangle is the point of intersection of the medians of that trinagle
Term
circumcenter of a triangle
Definition
the point of concurrency of the perpendicular bisectors of the sides of a triangle
Term
circumscribed about
Definition
a circle is ______________ about a polygon if the vertices of the polygon are on the circle. A polycon is ___________ about a circle if all the sides of the plygon are tangent to the circle.
Term
concurrent lines
Definition
three or more lines that meet in one point.
Term
contrapositive
Definition
the ____________ of the conditional "if p, the q" is the conditional if not q, then not p." a conditional and its ______________ always have the same truth value.
Term
coordinate proof
Definition
a figure is drawn on a coordinate plane and the formulas for slope, midpoint and distance are used to prove properties of the figure.
Term
distance from a point to a line
Definition
the length of the perpendicular segment from the point to the line.
Term
equivalent statements
Definition
statements with the same truth value
Term
incenter of a triangle
Definition
the point of concurrency of the angle bisectors of the triangle
Term
indirect proof
Definition
proof that is soved with indirect reasoning
Term
indirect reasoning
Definition
a type of reasoning in which all possibilities are considered an then the unwanted ones are proved false. The remaining possiblilites must be true.
Term
inscribed in
Definition
a circle is __________ in a plygon if the sides of the polygon are tangent to the circle. A polygon is ________ in a circle if the vertices of the plygon are on the circle.
Term
inverse
Definition
the _______ of the conditional "if p, then q" is the conditional "if not p, then not q."
Term
median of a triangle
Definition
a segment that has as its endpoints a vertex of the triangle and the midpoint of the opposite side.
Term
midsegment
Definition
the segment thatjoins the midpoints of two sides of the triangle.
Term
negation
Definition
the _______ of a statement has the opposite meaning of the original statement.
Term
orthocenter of a triangle
Definition
the point of intersection of the lines containing the altitudes of the triangle.
Term
point of concurrency
Definition
the point at which concurrent lines meet
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