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Regel

Area av en triangel

Arean av en triangel beräknas genom att multiplicera dess bas och höjd och dividera produkten med 2.

Rules triangelns area1.svg

Den här triangeln kan man skriva in i en rektangel med samma bas och höjd som i nedanstående figur.

Rules triangelns area2.svg
Rektangelns area är bh och man kan visa att triangeln är hälften av det vilket ger oss areaformeln.

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