44 terms

Vocabulary Quiz Unit 1

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point
a location in space that has no size
line
a straight path that extends forever in both directions
plane
a flat surface that has no thickness and extends forever
collinear
points that lie on the same straight line
coplanar
points and lines that lie in the same plane
line segment
part of a line with two endpoints
ray
a part of a line that starts at one endpoint and extends forever in one direction
intersection
the place or point where two lines or planes cross each other
parallel lines
coplanar lines that never intersect
distance
length of a path between two points
infinite
never ending
congruent
figures having the same size and the same shape; equal
midpoint
the point at which a line segment is divided into two equal segments
bisect
to divide into two equal parts
converse
a statement that switches the order of the hypothesis and the conclusion
conditional statement
an "if-then" statement
counterexample
an example that proves a statement false
hypothesis
the "if" part of a conditional statement
conclusion
the "then" part of a conditional statement
perpendicular lines
lines that intersect at 90 degree angles
transitive property
if a=b and b=c, then a=c
acute triangle
a triangle with all three angles less than 90 degrees
obtuse triangle
a triangle with one angle greater than 90 degrees
right triangle
a triangle with one 90 degree angle
Triangle Sum Theorem
the sum of all three angles in a triangle is 180 degrees
Exterior Angle Theorem
the measure of an exterior angle of a triangle is equal to the sum of the two remote interior angles of the triangle
Angle-Side-Angle Congruence
If two angles and the included side of one triangle are congruent to the corresponding two angles and included side of another triangle, then the triangles are congruent.
Side-Angle-Side Congruence
If two sides and the included angle of one triangle are congruent to the corresponding two sides and included angle of another triangle, then the triangles are congruent.
Angle-Angle-Side Congruence
If two angles and the non-included side of one triangle are congruent to the corresponding two angles and non-included side of another triangle, then the triangles are congruent.
Side-Side-Side Congruence
If three sides of one triangle are congruent to three sides of another triangle, then the triangles are congruent.
Octagon
An eight-sided polygon
Pentagon
A five-sided polygon
Triangle
A three-sided polygon
Hexagon
A six-sided polygon
Concave
A polygon in which at least one angle curves or dents inward
Convex
A polygon in which all of the angles curve or bulge outward
Regular
A polygon with all congruent sides and all congruent angles
Parallelogram
A quadrilateral with two pairs of parallel sides
Rhombus
A quadrilateral with four congruent sides
Square
A quadrilateral with four congruent sides and four right angles
Trapezoid
A quadrilateral with only one pair of parallel sides
Translation
A transformation where the pre-image "slides"
Rotation
A transformation where the pre-image "turns"
Reflection
A transformation where the pre-image "flips", creating a mirror image