Unit 1: Math Vocab

Front 1

Convex

Back 1

When no two points on the polygon go outside the edge of the polygon.

Front 2

Corresponding Angles

Back 2

Angles that are in the same location on the intersection of the parallel lines and the transversal. These angles are congruent.

Front 3

Line Segment

Back 3

A part of a line that is bounded by two distinct end points and contains every point on the line between the two end points.

Front 4

Line

Back 4

A straight, one-dimensional figure having no thickness and extending infinitely in both directions.

Front 5

Parallel Lines

Back 5

Lines that lie on the same plane and are the same distance apart over their entire length.

Front 6

Polygon

Back 6

A plane figure containing at least three straight sides and angles.

Front 7

Concave (Non-Convex)

Back 7

A polygon with one or more interior angles greater than 180 degrees.

Front 8

Parallelogram

Back 8

A quadrilateral with both pairs of opposite sides parallel.

Front 9

Consecutive (Same Side) Interior Angles

Back 9

Two interior angles lying on the same side of the transversal cutting across two parallel lines. These angles are supplementary.

Front 10

Regular Polygon

Back 10

A polygon with all sides and all angles equal.

Front 11

Acute Triangle

Back 11

A triangle in which all three angles are less than 90 degrees.

Front 12

Kite

Back 12

A quadrilateral containing two distinct pairs of equal and adjacent sides.

Front 13

Point

Back 13

A precise location or place on a plane.

Front 14

Reflective Symmetry

Back 14

A type of symmetry where one half is a reflection of the other half. If the image is folded on the line of symmetry, both halves must match.

Front 15

Reflex Angle

Back 15

An angle greater than 180 degrees and less than 360 degrees.

Front 16

Straight Angle

Back 16

An angle whose measure is exactly 180 degrees- a straight line.

Front 17

Heptagon

Back 17

A polygon of seven angles and seven sides.

Front 18

Rectangle

Back 18

A four-sided polygon where all interior angles are 90 degrees.

Front 19

Dihedral Angles

Back 19

A figure formed by two intersecting planes.

Front 20

Obtuse Angle

Back 20

An angle whose measure is greater than 90 degrees and less than 180 degrees.

Front 21

Alternate Interior Anlges

Back 21

Angles that are formed when a transversal crosses two parallel lines. Each pair of these angles are on the inside of the parallel lines and on opposite sides of the transversal. These angles are congruent.

Front 22

Line of Symmetry

Back 22

The imaginary line where you could fold the image and have both halves exactly alike.

Front 23

Rotational Symmetry

Back 23

This is present when an object is rotated about its center a certain number of degrees and looks identical to what it did in the original position. This must be less than 360 degrees.

Front 24

Simple Closed Curve

Back 24

A closed plane curve that does not intersect itself- also called a Jordan Curve.

Front 25

Isosceles Triangle

Back 25

A triangle which contains at least two sides of equal length.

Front 26

Vertex

Back 26

A point in which two or more straight lines meet.

Front 27

Ray

Back 27

A portion of a line which starts at a point and goes off in a particular direction to infinity.

Front 28

Adjacent Angles

Back 28

Two angles that share a common vertex and side, but do not overlap.

Front 29

Right Angle

Back 29

An angle whose measure is exactly 90 degrees.

Front 30

Obtuse Triangle

Back 30

A triangle containing an internal angle that is greater than 90 degrees and less than 180 degrees.

Front 31

Equilateral Triangle

Back 31

A triangle which has all three of its sides equal in length.

Front 32

Hypotenuse

Back 32

The longest side of a right triangle which is opposite the right angle.

Front 33

Skew Lines

Back 33

Two nonparallel lines in space that do not intersect.

Front 34

Alternate Exterior Angles

Back 34

Angles created when a transversal crosses two parallel lines. Each pair of these angles are outside the parallel lines and on opposite sides of the transversal. These angles are congruent.

Front 35

Legs

Back 35

Either of the two sides that make up a right triangle other than the hypotenuse.

Front 36

Pentagon

Back 36

A flat geometric figure having five angles and five sides.

Front 37

Diagonal

Back 37

A straight line inside a shape that goes from one corner to the other.

Front 38

Parallelogram

Back 38

A four-sided plane rectilinear figure with opposite sides parallel.

Front 39

Hexagon

Back 39

A polygon of six angles and six sides.

Front 40

Acute Angle

Back 40

An angle whose measure is between 0 and 90 degrees.

Front 41

Angle

Back 41

A shape formed by two lines or rays diverging from a common point or vertex.

Front 42

Triangle

Back 42

A closed figure consisting of three line segments linked end to end.

Front 43

Base Angles

Back 43

Either of the angles of a triangle that have one side in common with the base.

Front 44

Octagon

Back 44

A polygon of eight angles and eight sides.

Front 45

Trapezoid

Back 45

A quadrilateral which has exactly one pair of parallel sides.

Front 46

Rhombus

Back 46

A quadrilateral with all four sides equal in length.

Front 47

Right Triangle

Back 47

A triangle where one of its interior angle is 90 degrees.

Front 48

Supplementary Angles

Back 48

Two angles that sum to 180 degrees.

Front 49

Vertex Angle (Interior Angle)

Back 49

The point about which an angle is measured.

Front 50

Exterior Angle

Back 50

The angle between a side of a rectangular figure and an adjacent side extended outward.

Front 51

Central Angle

Back 51

The angle subtended at the center of a circle by two given points on the circle.

Front 52

Quadrilateral

Back 52

A flat shape with four straight sides.

Front 53

Square

Back 53

A four-sided, regular polygon with all sides equal and all internal angles 90 degrees.

Front 54

Plane

Back 54

A flat, two-dimensional surface that extends infinitely far with zero thickness.

Front 55

Complementary Angles

Back 55

Two angles that sum to 90 degrees.

Front 56

Perpendicular Lines

Back 56

When two lines cross to create 90 degree angle.

Front 57

Symmetry

Back 57

When a shape can be exactly like another when you move it in some way.

Front 58

Scalene Triangle

Back 58

A triangle where all three sides are different in length.

Front 59

Equiangular

Back 59

A polygon in which all its angles are congruent.

Front 60

Vertical Angles

Back 60

A pair of non-adjacent angles formed by the intersection of two straight lines.

Front 61

Isosceles Trapezoid

Back 61

A quadrilateral containing exactly one pair of parallel lines and two legs that are congruent in length.