How do you split up a triangle evenly

Write a function that matches the description. a cosine function has a maximum of 5 and a minimum value of -5. f (r) =

1mile equals approximately 1.6 kilometers. which best approximates the number of miles in 6 kilometers?

What is the greatest number of parts of a circle that can be formed by cutting the circle with 7 straight cuts? (note: the parts do not have to be equal in size)