Question

soma as medidas dos angulos internos de um quadrilatero convexo:

Answer 1

Si= ( n-2) • 180
Si= 4-2 • 180
Si= 2•180
Si= 360

Answer 2

$\large\boxed{\begin{array}{l} \underline{ \boldsymbol{f\acute{o}rmula}} \\\huge\boxed{\boxed{\boxed{\boxed{\rm{ \tt S_i = (n - 2) \cdot180 {}^{ \circ} }}}}} \\ \\ \sf S_i = (4 - 2) \cdot180 {}^{ \circ} = 2 \cdot180 {}^{ \circ} = 360 {}^{ \circ}\end{array}}$