Question

01) Determine o valor de x em cada caso sabendo que sen 18 ^ a = 0, 30 , cos 18 degrees = 0.95 tg 18 degrees = 0, 32 sen 54 degrees = 0, 80, cos 54 degrees = 0, 58 ctg 54 degrees = 1, 37

Answer 1

$\large\boxed{\begin{array}{l}\sf a)\,\rm sen(18^\circ)=\dfrac{x}{10}\\\\\rm x=10\cdot sen(18^\circ)\\\rm x=10\cdot0,30\\\rm x=3\\\sf b)\,\rm tg(54^\circ)=\dfrac{4}{x}\\\rm 1,37=\dfrac{4}{x}\\\\\rm 1,37x=4\\\rm x=\dfrac{4}{1,37}\\\\\rm x=2,91\end{array}}$