Femhörningens vinkelsumma: [url=https://www.geogebra.org/m/pxue2m7h]https://www.geogebra.org/m/pxue2m7h[/url][br]Pythagoras sats 1: [url=https://www.geogebra.org/m/dBu3hnqx]https://www.geogebra.org/m/dBu3hnqx[/url][br]Pythagoras sats 2: [url=https://www.geogebra.org/m/xzhpcx7r]https://www.geogebra.org/m/xzhpcx7r[/url][br]Vinklar vid parallella linjer: [url=https://www.geogebra.org/m/ztgesgr6]https://www.geogebra.org/m/ztgesgr6[/url][br]Triangelns area: [url=https://www.geogebra.org/m/TJdjAWwV]https://www.geogebra.org/m/TJdjAWwV[/url] [br]Cirkelns area: [url=https://www.geogebra.org/m/q4kwqgxg]https://www.geogebra.org/m/q4kwqgxg[/url][br]Volymen av ett rätblock: [url=https://www.geogebra.org/m/uksjm7kk]https://www.geogebra.org/m/uksjm7kk[/url][br]Area- och volymskala: [url=https://www.geogebra.org/m/xkfgcabv]https://www.geogebra.org/m/xkfgcabv[/url][br]Proof without words (engelsk bok): [url=https://www.geogebra.org/m/jFFERBdd]https://www.geogebra.org/m/jFFERBdd[/url] [br]Quadrilaterals (engelsk bok): [url=https://www.geogebra.org/m/GFwZ5qdf]https://www.geogebra.org/m/GFwZ5qdf[/url][br]Surface area and volume (engelsk bok): [url=https://www.geogebra.org/m/s7TznqSP]https://www.geogebra.org/m/s7TznqSP[/url]