Jump to Content

Loading...

GeoGebra

This is a Java Applet created using GeoGebra from www.geogebra.org - it looks like you don't have Java installed, please go to www.java.com

är ett program för matematikundervisning som kombinerar flera olika idéer i ett och samma paket. All programkod är öppen källkod och all dokumentation är under en Creative Commons License. Utvecklingen av GeoGebra drivs av engagerade lärare och av programutvecklare. Detta innebär dels att själva programvaran är gratis och dels att man har tillgång till ett aktivt användarforum

där man snabbt kan få svar på sina frågor och även diskutera utformningen av programmet.

Några av de viktigaste elementen i GeoGebra är dynamisk geometri, kalkylblad som verkar på både dynamiska objekt och tal, samt funktioner och interaktiv grafritning. För avancerade användare finns det möjligheter att använda kommandon som liknar sedvanlig programmering, man kan på så vis exempelvis iterera eller skapa villkorssatser.

Kägelsnitt

Om man har fem punkter, finns det ett och endast ett kägelsnitt

som kan dras mellan alla fem punkter. Ett kägelsnitt är antingen en ellips, en hyperbel eller en parabel. GeoGebras logo föreställer en ellips. Vill man se andra kägelsnitt, kan man dra i punkterna i den interaktiva logon ovan.

Search Help

Non Advanced Search or Natural Search

The documents are returned sorted on relevance depending on order, proximity, frequency of terms.

Advanced Search or Boolean Search

Default search behavior

By default, all search terms are optional. It behaves like an OR logic. Objects that contain the more terms are rated higher in the results and will appear first in their type. For example, wiki forum will find:

objects that include both terms
objects that include the term wiki
objects that include the term forum

Requiring terms

Add a plus sign ( + ) before a term to indicate that the term must appear in results. Example: +wiki forum will find objects containing at least wiki. Objects with both terms and many occurences of the terms will appear first.

Excluding terms

Add a minus sign ( - ) before a term to indicate that the term must not appear in the results. To reduce a term's value without completely excluding it, use a tilde. Example: -wiki forum will find objects that do not contain wiki but contain forum

Grouping terms

Use parenthesis ( ) to group terms into subexpressions. Example: +wiki +(forum blog) will find objects that contain wiki and forum or that contain wiki and blog in any order.

Finding phrases

Use double quotes ( " " ) around a phrase to find terms in the exact order, exactly as typed. Example: "Alex Bell" will not find Bell Alex or Alex G. Bell.

Using wildcards

Add an asterisk ( * ) after a term to find objects that include the root word. For example, run* will find:

objects that include the term run
objects that include the term runner
objects that include the term running

Reducing a term's value

Add a tilde ( ~ ) before a term to reduce its value indicate to the ranking of the results. Objects that contain the term will appear lower than other objects (unlike the minus sign which will completely exclude a term). Example: +wiki ~forum will rate an object with only wiki higher that an object with wiki and forum.

Changing relevance value

Add a less than ( < ) or greater than ( > ) sign before a term to change the term's contribution to the overall relevance value assigned to a object. Example: +wiki +(>forum < blog) will find objects that contain wiki and forum or wiki and blog in any order. wiki forum will be rated higher.

Search box