What are the only types of triangles we can use trigonometry with?

Which is the trig function that relates the opposite side and the hypotenuse?

Which is the trig function relates the opposite side and the adjacent side?

From the perspective of angle  $\theta$ , which trig ratio would correctly compare the 2 sides identified with stars?

From the perspective of angle $\theta$ , which trig ratio would correctly compare the 2 sides identified with stars?

From the perspective of angle $\theta$ , which trig ratio would correctly compare the 2 sides identified with stars?

From the perspective of angle $\theta$ , which trig ratio would correctly compare the 2 sides identified with stars?

From the perspective of angle $\theta$ , which trig ratio would correctly compare the 2 sides identified with stars?

From the perspective of angle $\theta$ , which trig ratio would correctly compare the 2 sides identified with stars?

From the perspective of angle $\theta$ , which trig ratio would correctly compare the 2 sides identified with stars?

From the perspective of angle $\theta$ , which trig ratio would correctly compare the 2 sides identified with stars?

From the perspective of angle $\theta$ , which trig ratio would correctly compare the 2 sides identified with stars?

From the perspective of angle $\theta$ , which trig ratio would correctly compare the 2 sides identified with stars?