Question

Qual o valor de x na figura a seguir? ( por favor com cálculos )

Answer 1

$\Large\boxed{\begin{array}{l}\sf\triangle AMN\sim\triangle ABC\\\sf\dfrac{12}{x}=\dfrac{45}{15}\\\\\sf\dfrac{12}{x}=3\\\\\sf 3x=12\\\sf x=\dfrac{12}{3}\\\huge\boxed{\boxed{\boxed{\boxed{\sf x=4}}}}\end{array}}$