Question

errei gente desculpa; a pergunta e quantos poligonos tem 25 lados

Answer 1

25.(25 - 3) / 2 = 25.22 / 2 = 275 diagonais.

Answer 2

$d = \frac{n(n-3)}{2} \\ \\ d = \frac{25(25-3)}{2} \\ \\ d = \frac{25.22}{2} \\ \\ d = \frac{550}{2} \\ \\ d = 275$