• Shuffle
Toggle On
Toggle Off
• Alphabetize
Toggle On
Toggle Off
• Front First
Toggle On
Toggle Off
• Both Sides
Toggle On
Toggle Off
Toggle On
Toggle Off
Front

### How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key

Play button

Play button

Progress

1/74

Click to flip

### 74 Cards in this Set

• Front
• Back
 ______ is defined as the ratio between the circumference and the diameter of a circle. pi _________(Bisector, Collinear, Concurrent, Corresponding) points lie on the same line. Collinear _________is the set of all points Space {rational numbers} union {irrational numbers} = real numbers A __________ of a polygon is a line that has vertices for endpoints but that is not a side of the polygon diagonal A ___________ of polygon is an endpoint of a side of the polygon. vertex A __________separates space into two half-spaces. plane A ∩ A' = empty (or null) set A closed curve made of segments polygon A cube is a regular ________________ (rectangle, polygon, hexahedron, square) hexahedron A curve that ends at its starting point closed A curve that is a subset of a circle arc A line segment with endpoints on a circle chord A parallelogram with a right angle rectangle A point divides a line into three disjoint sets, the point and _________. 2 half lines A polygon that is always convex triangle A polygon that is equilateral but not equiangular rhombus A polygon with eight sides octagon A polygon with no diagonals triangle A line is ___________ to a circle if it intersects the circle in only one point. tangent A statement accepted as true without proof postulate A tetrahedron has _________ faces. 4 A U A' = universal set All radii of the same circle are _________. congruent An angle is a set of points (true or false). TRUE An angle measuring 180 degrees straight An angle measuring between 90 and 180 degrees. obtuse An angle that measures 90 degrees right An angle with a measure between 0 and 90 degrees acute An octagon prism is a (decahedron, dodecahedron, hexahedron, oxyhedron) decahedron Any two points in space lie in one and only one __________. line Are all sides of an isoceles triangle equal? no Are all squares rectangles? yes Are all squares rhombi? yes Are regular polygons concave? no Can an equilateral triangle contain an obtuse angle no Four noncollinear points always determine _________. (nothing in particular) Geometry is an abstract model of _____________________________. our orderly physical universe Ideally a set of postulates should be ____________, ______________, and _____________. independent, consistent, complete If a > 0, then |a| = a, but if a < 0, then |a| = -a. FALSE If A is between B and C, and AB = CA if and only if _____________ A is the midpoint If P-D-F, then then D is ___________P and F. bewtween(PF = FP + DP) If R is the midpoint of of MA, the formula for the midpoint is ___________. r = (m+a)/2 If the radius of a circle is 4, what is the circumference? 8π If two angles are a linear pair are they supplementary angles? yes If X is in the interior of ABC, and mABX = mCBX, then BX is the ______ of ABC (ABC, ABX, CBX are angles, m means measure). bisector Is a rhombus a regular triangle? no Lines that intersect and form an angle measuring 90 degrees. perpendicular Lines that intersect in a single point are _________ lines. concurrent One radius is equal to ____ diameter. 1/2 Perpendicular lines form ___________ angles right Pi and the square root of 2 are ____________ numbers (integer, rational, irrational, imaginary) irrational Planes in space that do not intersect are ___________planes. parallel The intersection of two disjoint sets empty (or null) set The intersection of two distinct planes line The number of bases in a triangular pyramid one The opposite angles of two intersecting lines vertical angles The parallel sides of a trapezoid bases The set of points in a plane that are a given distance from a point circle The side opposite the right angle in a right triangle hypotenuse The sum of the lengths of the sides of a polygon perimeter The symbol for half-line EP is ____ EP (with o– above it) The three undefined terms are point, line, and plane The union of three noncollinear points and the line segments connecting them triangle The union of two coplanar half-planes and their common edge. plane The union of two distinct rays with a common endpoint angle Two adjacent angles that are supplementary linear pair Two angles whose measures have a sum of 90 degrees complementary Two interesecting lines are contained in one and only one __________. plane When two lines intersect, they intersect in one and only one ____________. point Which is a regular polygon (pentagon, octagon, square, triangle, none of these)? square Which is not a polyhedron? (pyramid, cube, prism, cone, none of these) cone Which of the following is not a polygon? rectangle, base of a pyramid, base of a cone, triangle) base of a cone (a circle) Who systematized geometry around 300 B.C. Euclid