Harcourt Math (Grade 4): Geometry Flashcards


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created 12 years ago by jjaysummers
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Harcourt Math (Grade 4)
Chapters 17-20
All 4th Grade Geometry Terms
updated 12 years ago by jjaysummers
Grade levels:
4th grade
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Point

An exact location on a line, in a plane or in a space.

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Line

A straight path of many points that goes on forever in two directions.

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Line Segment

A part of a line that has two end points.

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Ray

A part of a line that goes on forever in one direction.

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Plane

A flat surface of points that goes on in all directions and is named by three points.

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Angle

Two rays with the same end point.

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Protractor

A tool used to measure angles.

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*

Degree

The unit used to measure the size of an angel.

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Right Angle

An angel that measures 90* and forms a square corner.

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Acute Angle

An angle that measures less than 90* (cute!)

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Obtuse Angle

An angle that measures more than 90* (fat!)

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Straight Angle

An angle that measures exactly 180* (line)

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Intersecting Lines

Lines that cross each other to form 4 angles.

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Parallel Lines

Lines in a plane that never intersect and are ALWAYS the same distance apart.

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Perpendicular Lines

Lines in a plane that meet and form a RIGHT angle.

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Vertex

The point at which two rays meet to form an angle.

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Polygon

A closed plan figure with straight sides.

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Triangle

A polygon with three sides.

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Quadrilateral

A polygon with four sides.

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Pentagon

A polygon with five sides.

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Hexagon

A polygon with six sides.

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Octagon

A polygon with eight sides.

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Regular Polygon

A polygon where all sides and angles are equal.

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Irregular Polygon

A polygon where all angles and sides are not equal.

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Equilateral Triangle

A triangle with three equal sides.

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Isosceles Triangle

A triangle with three equal sides.

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Scalene Triangle

A triangle with no equal length sides.

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Right Triangle

A triangle with one right angle.

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Acute Triangle

A triangle with 3 acute angles.

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Obtuse Triangle

A triangle with 1 obtuse angle.

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Trapezoid

A quadrilateral with exactly one pair of parallel lines.

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Venn Diagram

A diagram that shows relationships (how things are the same and different) between things.

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Line Symmetry

What a figure has if it can be folded along a line so that both sides match perfectly.

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Rotational Symmetry

What a figure has if it can be turned around a central point and still look the same in two positions.

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Congruent

Having the same size and shape.

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Similar

Having the same shape but different size.

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(7,6)

Ordered Pair

Two numbers that are used to locate a point on a coordinate grid.

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X-Axis

The horizontal line on a coordinate grid. (like a bed)

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Y-Axis

The vertical side of a coordinate grid. (Think, a pillar)

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X-Coordinate

The first number in an ordered pair.

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Y-Coordinate

The second number in an ordered pair.

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Area

The space inside of a shape. It is measured in square units. The formula is a= l x w (area = length x width)

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Perimeter

The the sum of all of the sides.

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Cone

a solid, pointed figure that has a flat round base.

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Coordinate Grid

A grid formed by a horizontal line called the x-axis and a vertical line called the y-axis.

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Cube

A solid figure with six congruent square faces

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Cylinder

A solid figure that is shaped like a can.

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Edge

The line segment where two or more faces of a solid figure meet.

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Face

A polygon that is the flat surface of a solid figure.

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Net

A two-dimensional (flat) pattern that can be foled to make a three-dimensional figure.

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Open figure

A figure that does not begin and end at the same point.

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Square Pyramid

A solid figure with a square base and four triangular sides that meet at a single point.

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Rectangular Prism

A solid figure in which all six faces are rectangles.

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Sphere

A round object whose curved surface is the same distance from the center to all its points.

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Triangular Prism

A solid figure that has two triangular bases and three rectangular bases.