Question

Em cada uma das figuras, vamos indicar por t a medida do arco AB e por s a medida do arco CD. Determine a medida x, em função de t e s​

Answer 1

$\large\boxed{\begin{array}{l}\rm a)~perceba~que~x~\acute e\,um\,\hat angulo\,exc\hat entrico\,interior.\\\rm como~~^\frown_{\!\!\!{AB}}=t~e~~^\frown_{\!\!\!{CD}}=s\\\rm podemos~escrever~\\\huge\boxed{\boxed{\boxed{\boxed{\rm x=\dfrac{t +s}{2}}}}}\end{array}}$

$\large\boxed{\begin{array}{l}\rm b)\\\rm Note\,que\,x\,representa\,um\,\hat angulo\\\rm exc\hat entrico\,exterior.\\\rm portanto\\\huge\boxed{\boxed{\boxed{\boxed{\rm x=\dfrac{t-s}{2}}}}}\end{array}}$