5-6-7 özel üçgeninin alanı, taban ve yüksekliğinin yarısının çarpımıyla bulunur. Bu üçgende: - taban 5 birimdir, - yükseklik 6 birimdir. O halde, alan: Alan = (taban x yükseklik) / 2 = (5 x 6) / 2 = 15 birim kare.
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