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melnikdasha773
@melnikdasha773
June 2022
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у прямокутному трикутнику АВС кут С = 90° ,АС = 3, ВС =4, обчисліть косинус кута А
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Banabanana
Verified answer
1. По теореме Пифагора:
АВ² = АС² + ВС²
АВ² = 3² + 4² = 9 + 16 = 25
АВ = √25 = 5 (см)
2. cosA = AC/AB = 3/5 = 0.6
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Answers & Comments
Verified answer
1. По теореме Пифагора:АВ² = АС² + ВС²
АВ² = 3² + 4² = 9 + 16 = 25
АВ = √25 = 5 (см)
2. cosA = AC/AB = 3/5 = 0.6