Question

qual o numero de diagonais de um quadrilatero ?

Answer 1

Resposta:

d=n(n-3)/2   ...n: número de lados

d=4*(4-3)/2 = 2 diagonais

Answer 2

$\large\boxed{\begin{array}{l} \underline{ \boldsymbol{f\acute{o}rmula }} \\ \huge\boxed{\boxed{\boxed{\boxed{\rm{ \tt{d = \frac{n \cdot(n - 3)}{2} }}}}}} \\ \\ \sf d = \dfrac{4 \cdot(4 - 3)}{2} = \dfrac{4 \cdot1}{2} = \dfrac{4}{2} = 2\end{array}}$