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Regel

Area av en rektangel

En rektangels area beräknas genom att multiplicera sidlängderna b och h. Rektangeln kan tolkas som att den är uppbyggd av ett stort antal raka streck av längden b. "Antalet" streck ges av höjden h. Genom att multiplicera får vi hur stor yta strecken täcker tillsammans.

Rules Area av rektangel1.svg
Rektangelns area beräknas alltså genom att multiplicera dessa sidlängder
A=bh.

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