Question

Ajudem, por favor! ​

Answer 1

Resposta:

a) x / sen45 = 5 / sen30

x / √2/2 = 5 / 0,5

x / √2/2 = 10

x = √2/2.10

x = 10√2/2

x = 5√2

x^2 = 5^2 + 7^2 - 2 . 5 . 7 . √3/2

x^2 = 25 + 49 - 70 . 0,87

x^2 = 74 - 70 . 0,87

x^2 = 4 . 0,87

x^2 = 3,48

x = √3,48

x = ≅1,865