Question

Um triângulo retângulo tem um ângulo A cujos catetos medem 9 cm (oposto) e 40 cm (adjacente). Calcule o seno do ângulo A.

Ask by Jimenez Frank. in Angola
Jan 14,2025

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Tutor-Verified Answer

Answer

O seno do ângulo \( A \) é \( \frac{9}{41} \) ou cerca de \( 0{,}2195 \).

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Mind Expander

Para calcular o seno do ângulo A em um triângulo retângulo, usamos a definição de seno, que é a razão entre o comprimento do cateto oposto e a hipotenusa. Nesse caso, o cateto oposto ao ângulo A mede 9 cm. Primeiro, precisamos calcular a hipotenusa, que pode ser encontrada usando o teorema de Pitágoras: hipotenusa² = cateto oposto² + cateto adjacente². Assim, hipotenusa² = 9² + 40² = 81 + 1600 = 1681. Portanto, a hipotenusa = √1681 = 41 cm. Agora podemos calcular o seno: seno A = cateto oposto / hipotenusa = 9 cm / 41 cm ≈ 0,2195. Portanto, o seno do ângulo A é aproximadamente 0,2195.

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