Angles
An angle that is greater than 0o but less than 90o
Acute
A triangle that contains a right angle
Right triangle
The perimeter of a circle
Circumference
A straight line is the _?_ between two points
Shortest distance (or shortest line)
The sum of all the angles about a point on one side of a straight line through the point is _?_.
An angle that is greater than 90o but less than 180o
obtuse
A triangle that has all three sides equal
Equilateral
The line that goes through the center whose endpoints are on the circle
Diameter
A geometric assumption accepted without proof to be true
Postulate
C.P.C.T.E. stands for _?_.
"Corresponding parts of congruent triangles are equal."
Two angles that add up to 90o
Complementary angles
Definition of an isosceles triangle
A triangle that has at least two sides equal
The line that joins the center of the circle with any point on the circle
Radius
A general statement accepted without proof to be true
Axiom
An equilateral triangle is also _?_.
Equiangular
Two angles that add up to 180o
Supplementary angles
Any two triangles are congruent if...
(various answers)
SAS, ASA, or SSS
Any portion of a circle
Arc
A statement that is not self-evident but must be proved through a chain of reasoning
Theorem
_?_ opposite equal sides in a triangle are equal.
Angles
If two angles in a triangle are 46o and 82o, what is the measure of the third angle?
52o
(various answers)
LL or LA
The relationship between the radius and diameter of a circle
The radius is half of the diameter (or the diameter is twice the radius)
An exterior angle of a triangle is _?_ (greater than, less than, or equal to) either opposite interior angle.
Greater than
What is the converse of the statement "If a triangle has at least two sides equal, it is an isosceles triangle"?
If a triangle is an isosceles triangle, then it has at least two sides equal.