Question

observe a figura ao lado e determine o comprimento do arco BB​

Answer 1

$\boxed{\begin{array}{l}\sf calculo\,do\,comprimento\,da\,circunfer\hat encia:\\\sf C=2\pi r\\\sf C=2\pi\cdot6\\\sf C=12\pi~\\\sf montando\,uma\,regra\,de\,tr\hat es\,temos:\\\sf 360^\circ\longrightarrow 12\pi\\\sf 40^\circ\longrightarrow \ell\\\sf 360\ell=12\pi\cdot40\\\sf \ell=\dfrac{\diagup\!\!\!\!\!\!12\pi\cdot4\backslash\!\!\!0}{\diagup\!\!\!\!\!\!36\backslash\!\!\!0}\\\\\sf \ell=\dfrac{4\pi}{3}\\\\\sf \ell=\dfrac{4\cdot3,14}{3}\\\\\sf \ell=4,18~u\cdot c\end{array}}$