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chapter 1

acute angle greater than 0 degrees and less than 90 degrees
adjacent angle two angles in same plane with a common vertex and a common interior points
angle figure formed by two rays, or sides
angle bisector a ray that divides any angle into two congruent angles
area number of nonoverlappping square units of a given size that exactly cover the figure
base any side of a figure
between given three point A,B and C,B is between A and C if and only if all three of the points lie on the same linear and AB+BC= AC
bisect to divide into two congruent parts
circumference a circle is the distance around a circle
collinear points that lie on the same line
complementary angles two angles whose measure have a sum of 90 degrees
congruent angles angles that have the same measure
congruent segments segments that have the same lengths
construction a way of creating a figure that is more precise
coordinate a point corresponds to one and only number on the ruler
coordinate plane a plane that is divided into four regions by a horizontal line (x-axis) and a vertical line (y-axis)
coplanar points that lie in the same plane
degree a unit of angle measure; one degree is 1/360 of a circle
diameter segment that passes through the center of the circle and whore endpoints are on the circle
distance between any two points is the absolute value of the difference of the coordinates
endpoint a point at one end of a segment or the starting point of a ray
exterior of an angle set of all points outside the angle
height a segment from a vertex that forms a right angle with a line containing the base
hypotenuse the side across from the right angle that stretches from one leg to the other
image resulting figure
interior of an angle the set of all points between the side of the angle
leg one of the two congruent sides of the isosceles triangles
length the distance between the two endpoints of a segment
line a straight path that has no thickness and extends forever
linear pair pair of adjacent angles whose noncommon sides are opposite rays
measure angles are measured in degrees
midpoint the points that divides a segment into two congruent segment
obtuse angle measure greater than 90 degrees and less than 90 degrees
opposite rays two rays that have a common endpoints and form a line
perimeter sum of the side lengths of the figure
pi the ratio of the circumference of a circle to its diameter (3.14 or 22/7)
plane a flat surface that has no thickness and extends forever
point names a location and has no size
postulate (axiom) a statement that is accepted as true without proof POSTULATE ABOUT POINTS, LINES, AND PLANES HELP DESCRIBE GEOMETRIC PROPERTIES
preimage the original figure
radius a segment whose endpoints are the center of the circle and a point on the circle
ray part of line that starts at an endpoint and extents forever in one directon
refection ( flip)
right angles measure 90 degrees `
rotation(turn) each point and its image are the same distance from p
segment part of a line consisting of two points and all point between them
segment bisector any ray segment or line that intersects a segment its midpoints
straight angle formed by two opposite rays and measure 180 degrees
supplementary angles two angles whose measures have a sum of 180 degrees
transformation a change in the position, size, or shape of a figure
translation ( slide) which all the points of a figure move the same distance in the same direction
undefined term basic figure
vertex common endpoints
vertical angles two nonadjacent angles formed by two insecting lines
Created by: 100000461441232