A person sprints around a circular track and stops after running 40 percent around the circumference of the track. If the total distance traveled was 80π meters, what is the diameter of the circular track?

How do you write something in scientific notation?

Jordan got 27 out of 90 correct on his test . what fraction of the marks did her get correct

Solve these problems: 1.what is the perimeter of an equilateral triangle with sides measuring 6cm? 2. a regular pentagon has sides measuring 3.2 cm. what is its perimeter? 3. a regular decagon has sides of 3.5mm . what is it’s perimeter? 4. a regular octagon has a perimeter of 64cm. what is the length of one of the sides? 5. a regular hexagon has a perimeter of 72mm . what is the length of one of the sides? 6. what is the perimeter of a rhombus with sides measuring 11m?