Use a common denominator to determine whether the ratios form a proposition
1/8 and 3/20

a: no, they do not form a proposition

b: yes, they form a proposition

Answer the questions in the attachment. a rescue helicopter is at point a and a rescue boat is at point e. the helicopter pilot spots boats in distress at points d and c, with angles as marked in the diagram. figure abce is a rectangle. the altitude of the rescue helicopter, represented by ae, is 5000 feet.

Find the value of the cosine for angle a

What is the length of the unknown leg in the right triangle ?