54 terms

Pre-Algebra Geometry Vocab Quiz

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Point
an exact location in space, describes a location but has no size
Line
infinitely many points that extend forever in one direction; they have direction and location and they are always straight
Plane
infinitely many intersecting lines that extend forever in all directions
Collinear
points that lie on the same line
Non-collinear
a point located above or below the line of another point
Ray
part of a line; begins with an endpoint and extends forever away from endpoint in one direction (straight)
Parallel
never intersecting lines/rays that are in the same plane
Line Segment
portion of a line with two endpoints; finitive part of a line that stops at both ends
Skew Lines
lines that are in different planes and never intersect
Endpoint
a point at the end of a line segment or one end of a ray
Congruent Angle
equal measurement
Right Angle
x=90º
Acute Angle
x<90º
Obtuse Angle
90º<x<180º
Complementary
sum is 90º
Supplementary
sum is 180º
Adjacent Angle
when two lines intersect, they are next to each other and share a ray
Straight Angle
180º
Transversal
a line that intersects two distinct lines
Space
set of all points extending in three dimensions
Coplanar
points and/or lines within the same plane
Non-coplanar
points and or lines that are not within the same plane
Intersection
a point or set if points where lines, planes, segments, or rays overlap
Vertical Angles
when two lines intersect, they are across from one another and share one vertex
Angle
when two rays meet at there endpoint
midpoint
the exact middle point
angle
formed by intersecting lines or rays
perpendicular lines
lines that are at right angles to each other (90º)
vertex of an angle
A point where two or more straight lines meet to create an angle
side of an angle
two lines that make up the vertex and angle
scalene triangle
triangle that has three unequal sides
isosceles triangle
a triangle with two equal sides
equilateral triangle
a triangle in which all three sides are equal
polygon
a plane figure with at least three straight sides and angles
regular polygon
when all angles are equal and all sides are equal
diagonal
A straight line inside a shape that goes from one corner to another
triangle
a plane figure with three straight sides, three angles, and no diagonals
trapezoid
A 4-sided flat shape with straight sides that has a pair of opposite sides parallel
parallelogram
A 4-sided flat shape with straight sides where opposite sides are parallel (opposite sides- equal length and angles)
rhombus
A 4-sided flat shape with straight sides where all sides have equal length, opposite sides are parallel, and opposite angles are equal.
square
A 4-sided flat shape with straight sides where: all sides have equal length, and every interior angle is a right angle (90°)
rectangle
A 4-sided flat shape with straight sides where all interior angles are right angles (90°). Also opposite sides are parallel and of equal length. Square is a special type of this.
alternate interior angle
The pairs of angles on opposite sides of the transversal but inside the two lines
corresponding angle
The angles in matching corners
symmetrical
made up of exactly similar parts facing each other or around an axis
reflection
An image or shape as it would be seen in a mirror
rotation
central point that stays fixed and everything else moves around that point in the center
translation
"Sliding": moving a shape without rotating or flipping it. The shape still looks exactly the same, just in a different place.
irregular polygon
A polygon that does not have all sides equal and all angles equal.
quadrilateral
A flat shape with four straight sides.
linear pair
a pair of adjacent, supplementary angles (180°)
alternate exterior angles
The pairs of angles on opposite sides of the transversal but outside the two lines
consecutive interior angles
The pairs of angles on one side of the transversal but inside the two lines
transformation
Changing a shape using
• Turn
• Flip
• Slide, or
• Resize
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