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Chapter 1
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Gravity
Key Concepts:
Terms in this set (49)
absolute value
the magnitude of a real number without regard to its sign.
acute angle
An angle that measures less than ninety degrees but more than zero degrees.
adjacent angles
they have a common side and a common vertex (corner point), and don't overlap.
angle
the space (usually measured in degrees) between two intersecting lines or surfaces at or close to the point where they meet.
angle bisector
s a line or ray that divides an angle into two congruent angles.
area
the extent or measurement of a surface or piece of land.
base
a base or radix is the number of different digits or combination of digits and letters that a system of counting uses to represent numbers.
bisect
to cut it into two equal parts.
circumference
a circle is the distance around the circle. It is the circle's perimeter.
collinear
three or more points , , , ..., are said to be collinear if they lie on a single straight line .
complementary angles
Two Angles are Complementary when they add up to 90 degrees
congruent angles
Congruent Angles have the same angle
congruent segments
line segments that are equal in length.
construction
To draw a shape, line or angle accurately using a compass and straightedge
coplanar
three or more points which lie in the same plane.
degree
he unit of angle measure defined such that an entire rotation is .
diameter
any straight line segment that passes through the center of the circle and whose endpoints lie on the circle.
distance
The distance between two points is the length of a straight line segment that links them.
endpoint
All of the points can be endpoints, because A and B are endpoints of line segment AB, C is an endpoint of line segment AC, and D is the endpoint of the ray.
exterior of an angle
an angle formed outside a polygon by one side and an extension of an adjacent side; the supplement of an interior angle of the polygon.
image
an image is the subset of a function's codomain which is the output of the function from a subset of its domain.
interior of an angle
an Interior Angle of a polygon is the angle formed inside it by any two adjacent sides of the polygon.
leg
leg of a triangle is one of its sides.
length
when referring to measurement in one dimension (as in the length of a line segment or a or a piece of string), has a specialized meaning.
line
is straight (no curves), • has no thickness, and. • extends in both directions without end (infinitely).
line segment
line segment is a part of a line that is bounded by two distinct end points, and contains every point on the line between its endpoints.
linear pair
A linear pair is a pair of adjacent, supplementary angles.
measure
A number that shows the size or amount of something.
midpoint
A point on a line segment that divides it into two equal parts.
obtuse angle
An angle that measures more than 90 degrees but less than 180 degrees
opposite rays
pair of opposite rays are two rays that have the 'same endpoint and extend in opposite directions.
pi
Pi is a number - approximately 3.142. It is the circumference of any circle divided by its diameter.
plane
a plane is a flat, two-dimensional surface that extends infinitely far.
point
It has no size i.e. no width, no length and no depth. A point is shown by a dot.
postulate
A postulate is a truth without formal proof.
preimage
The set of arguments of a function corresponding to a particular subset of the range.
radius
a radius of a circle or sphere is any of the line segments from its center to its perimeter, and in more modern usage, it is also the length of any of them.
ray
A ray is a line with an endpoint that extends infinitely in one direction.
reflection
a reflection is a type of rigid transformation in which the preimage is flipped across a line of reflection to create the image.
right angle
Right angles are one of the most common and interesting angles in all of geometry.
rotation
has a central point that stays fixed and everything else moves around that point in a circle.
segment
a line segment is a part of a line that is bounded by two distinct end points, and contains every point on the line between its endpoints
segment bisector
line, ray or segment which cuts another line segment into two equal parts.
square root
The square root of a number is a number which multiplied by itself, gives you the original number.
straight angle
changes the direction to point the opposite way.
supplementary angles
Two Angles are Supplementary when they add up to 180 degrees.
undefined terms
These words are point, line and plane, and are referred to as the "three undefined terms of geometry".
vertex
each angular point of a polygon, polyhedron, or other figure.
vertex angles
The point about which an angle is measured is called the angle's vertex, and the angle associated with a given vertex is called the vertex angle.
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