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Vocab Week 1 Geometry
Geometry
43
Mathematics
10th Grade
08/13/2012

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Term
Points
Definition
Has no size, but has a position
Term
Lines
Definition
Straight and doesn't curve.
Term
Rays
Definition
A part of a line that begins at a particular point (called the endpoint) and extends endlessly in one direction.
Term
Straight Angle
Definition
A line that is equally being extended by two points.
Term
Acute Angles
Definition
Angle that is less than 90 degrees.
Term
Obtuse Angles
Definition
Angle that is more than 90 but less than 180.
Term
Right angles
Definition
Angle that is exactly 90 degrees.
Term
Coplanar
Definition
Geometric objects that lye on the same plane.
Term
Collinear
Definition
Three or more points that lie in the straight line.
Term
Congruent
Definition
Equal in size and shape.
Term
Complementary
Definition
Angles that add up to 90 degrees.
Term
Supplementary
Definition
Angles that add up to 180 degrees.
Term
Bisector
Definition
Line that bisects an interior angle.
Term
Angle Addition
Definition
If a point S lies in the interior of ∠PQR, then ∠PQS + ∠SQR = ∠PQR.
Term
Postulate
Definition
Statement that is acclaimed to be true but with no proof.
Term
Vertical Angles
Definition
Angles that are opposite each other when they cross.
Term
Adjacent Angles
Definition
Angles that have a common side and vertex.
Term
Converse
Definition
When you reorder the conditional statement by flipping the hypothesis and the conclusion
Term
Conditional
Definition
An if/then statement
Term
Conclusion
Definition
The "then" part in the conditional
Term
Hypothesis
Definition
the "if" part in the conditional
Term
Counterexample
Definition
A way to test if the conditional is true or false.
Term
Distance
Definition
The extent or amount of space between two things, points, lines, etc.
Term
Coordinate
Definition
Of the same order or degree.
Term
Endpoints
Definition
The point on each side of the interval marking its extremity on that side.
Term
Midpoint
Definition
A point at or near the middle of both ends, as of a line.
Term
Pythagorean Thereom
Definition
a squared + b squared = c squared.
Term
Right Triangle
Definition
A triangle in which one angle is a right angle.
Term
Hypotenuse
Definition
Longest side of a right triangle.
Term
Legs
Definition
The two sides that are equal in length in an isosceles triangle.
Term
Plane
Definition
A surface generated by a straight line moving at a constant velocity with respect to a fixed point.
Term
Segment
Definition
A part cut off from a figure, especially a circular or spherical one, by a line or plane, as a part of a circular area contained by an arc and its chord or by two parallel lines or planes.
Term
Space
Definition
The set of all possible points; made up of infinite planes
Term
Parallel Lines
Definition
Lies on the same plane, and are the same distance apart over their entire length.
Term
Parallel Planes
Definition
Planes that never intersect each other.
Term
Perpendicular
Definition
Lines that are at right angles (90°) to each other.
Term
Transversal
Definition
A line that cuts across two or more (usually parallel) lines.
Term
Same-Side Interior
Definition
The angle pairs that are on the insides of the two lines (the interior) and on the same side of the transversal.
Term
Alternate Interior
Definition
The pairs of angles on opposite sides of the transversal but inside the two lines.
Term
Sequence
Definition
Made by multiplying by some value each time.
Term
Pattern
Definition
Things that are arranged following a rule or rules.
Term
Recursive
Definition
Pertaining to or using a rule or procedure that can be applied repeatedly.
Term
Explicit
Definition
A formula that allows direct computation of any term for a sequence
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