Lines and angles
the intersection of two surfaces
a general statement accepted without proof to be true
axiom
An equilateral triangle is also _?_
equiangular
transversal
a quadrilateral with only two sides parallel
trapezoid
the line drawn from any vertex of a triangle to the midpoint of the opposite side
median
a geometric assumption accepted without proof to be true
postulate
What does CPCTE stand for?
Two lines are parallel if _?_
alternate interior or corresponding angles are equal; if they are perpendicular to the same line; if the interior angles on the same side of the transversal are supplementary
the sum of all the angles in a hexagon (in degrees)
720 degrees
The sum of the three angles of a triangle
180 degrees
the whole is _?_ any of its parts
greater than
Name two ways to prove that any two triangles are congruent
SAS, ASA, SSS, SAA
a parallelogram having two adjacent sides equal
rhombus
the measure of one angle in an equilateral decagon
144 degrees
The two acute angles in a right triangle are _?_
complementary
a statement of beginning facts in a proof about lines, angles, figures, etc...also called the hypothesis in a formal proof
given
An exterior angle of a triangle is equal to the _?_ of the two opposite interior angles
sum
two congruent triangles
the three altitudes of a triangle meet in a point called the _?_
orthocenter
Any straight line whose ends are on the circle
chord
State the converse of the following statement:
"If ABCD is a square, then ABCD is a rectangle."
"If ABCD is a rectangle, then ABCD is a square."
the perpendicular bisectors of the sides of a triangle meet in a point called the _?_
circumcenter
the consecutive angles of a parallelogram are _?_
supplementary
means "center-like" ; the center of mass of a triangle
centroid