The distance across a circle through it’s center is called the

How do you find the circumfrance of a circle?

From the top of a tree a bird looks down on a field mouse at an angle of depression of 50°. if the field mouse is 40 meters from the base of the tree, find the vertical distance from the ground to the bird's eyes.

What is the approximate mark up percentage rate before m equals $1740 marked up from p equals $19,422