Pessoal oque eu vou colocar aqui não é uma questão é apenas uma dúvida que eu gostaria de tirar: O angulo externo de um quadrilatero e sempre o dobro do se angulo interno adjecente a ele???

On an airplane there are two seats on the left side and three seats on the right side there are 90 seats o the right side of the plane

In the equations, a and b represent the price per night for a room in hotel a and hotel b, respectively, w weeks after september 1 last autumn. what was the price per night in hotel a when it was equal to the price per night in hotel b? a = 240 − 20w b = 320 − 30w

Secant be and cf intersect at point d inside a what is the measure of cde