a location in space that has no size
a straight path that extends forever in both directions
a flat surface that has no thickness and extends forever
points that lie on the same straight line
points and lines that lie in the same plane
part of a line with two endpoints
a part of a line that starts at one endpoint and extends forever in one direction
the place or point where two lines or planes cross each other
coplanar lines that never intersect
length of a path between two points
figures having the same size and the same shape; equal
the point at which a line segment is divided into two equal segments
to divide into two equal parts
a statement that switches the order of the hypothesis and the conclusion
an "if-then" statement
an example that proves a statement false
the "if" part of a conditional statement
the "then" part of a conditional statement
lines that intersect at 90 degree angles
if a=b and b=c, then a=c
a triangle with all three angles less than 90 degrees
a triangle with one angle greater than 90 degrees
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
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.
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.
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.
If three sides of one triangle are congruent to three sides of another triangle, then the triangles are congruent.
An eight-sided polygon
A five-sided polygon
A three-sided polygon
A six-sided polygon
A polygon in which at least one angle curves or dents inward
A polygon in which all of the angles curve or bulge outward
A polygon with all congruent sides and all congruent angles
A quadrilateral with two pairs of parallel sides
A quadrilateral with four congruent sides
A quadrilateral with four congruent sides and four right angles
A quadrilateral with only one pair of parallel sides
A transformation where the pre-image "slides"
A transformation where the pre-image "turns"
A transformation where the pre-image "flips", creating a mirror image