Take the circumference of the circle and divide by two times pi for circle with a circumference of 15 you should divide by 15 by 2×3.14 and round the decimal point to your answer of approximately 2.39
In a circle, if you drew a line that passed through both edges of the circle and through the center, that would be your diameter. The length from the center point to any point on the outside of the circle is called the radius, which happens to also be exactly 1/2 of the diameter. To find the radius, simply divide the length of the radius by 2 and that will give you the radius!
An altitude of a triangle always extends from a vertex to the opposite base (side) of the triangle, and it is always at a right angle. It is also known as the "height".
