54 terms

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

• Turn

• Flip

• Slide, or

• Resize