Hallar el perímetro de los triángulos cuyos vértices están dados por: a) A(-2,5) B(4,3) C(7,-2) b) A(0,4) B(-4,1) C(3,-3)

Okay so i'm taking an online spanish course (penn foster), and in the study guide, you have to create a bunch of sentences with words you've learned so far. translating, reading, and those kinds of things are fairly easy, but when it comes to making my own sentences, my brain just kinda waltz's away. anyone got any tips?

Write a paragraph, in spanish, giving advice to a friend about the dos and don’ts of staying safe at the beach.

En que el retiro es un parque emblemático de madrid. a. estoy harto b. estoy de acuerdo c. estoy en camino d. estoy en las nubes