measurement geometry and mesurement

Ruler

a tool used to measure length

Unit

a standard measure for reporting the magnitude (size) of a variable such as length, mass, or time

Example.

kilograms (kg), seconds (s), ounces (oz)

Estimate (verb)

To approximate a value by comparing to a known value.

Approximation

A value chosen to represent the size or magnitude of a value; the approximation is similar to, but not equal to, the actual value.

Example.

1.29 cm is approximately 1.3 cm

The Metric System

a standard system of measurement based on powers of 10.

Example.

meters, liters, grams

English system / Imperial system

a system of measurement used in the United States using units such as feet, pounds and ounces

Rounding

A number is simplified to its closest multiple of 10, 100, 1,000, etc.

Example.

26 rounds to 30

Dimensional Analysis / Unit Analysis

the process of converting within or between systems by multiplying by factors of 1 in various forms

Example.

Invariance

Consistency of the size or magnitude of a value regardless of a change in units.

Example.

Converting a length from cm to inches does not change the length.

Proportion

the relative size of elements in a design

Example.

using larger images to make them the focal point in a layout

Scale

a device that measures the weight of an object

Protractor

A flat, semicircular tool divided into degrees and used to measure angles

Liters (l)

Term definition.

the base metric unit of volume

Measurable Attribute

Characteristic of an object that can be assigned a size or magnitude.

Example.

Mass, elapsed time, volume

Tolerance (in stats)

the amount of measurement error that is allowed

Meters (m)

the unit for distance in the metric system

Example.

The pool was 6 m deep.

Measurement

a number that shows the size or amount of something

Error (in measurement)

Error is a numerical value that tells us how far "off" a measurement is compared to the correct or accepted value.

Grams (g)

the base metric unit of mass