Предмет: Геометрия, автор: barik1998

один із катетів прямокутного трикутника дорівнює 21см, а другий катет на 7 см менший від гіпотенузи. знайдіть площу трикутника

Ответы

Автор ответа: Maya121998

нехай х- гіпотенуза, х-7- другий катет
за Піфагором: х^2=441+х^2-14х+49, 14х=490, х=35
отже другий катет = 35-7=28
S=ab/2=21*28/2=294

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