Question

Determine o valor de x na figura abaixo:
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Answer 1

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$\Large\boxed{\sf{\underline{Relac_{\!\!,}\tilde{a}o~entre~secantes}}}\\\boxed{\boxed{\boxed{\boxed{\boxed{\tt{\overline{PA}\cdot\overline{PB}=\overline{PC}\cdot\overline{PD}}}}}}}}$

$\sf{4\cdot18=x\cdot2x}\\\sf{2x^2=72}\\\sf{x^2=\dfrac{72}{2}}\\\sf{x^2=36}\\\sf{x=\sqrt{36}}\\\huge\boxed{\boxed{\boxed{\boxed{\boxed{\tt{x=6}}}}}}$