You used the diameter (9), rather than the radius. The radius is the diameter divided by 2. Therefore, your equation should be: 2 x 3.142 x 4.5, NOT 2 x 3.142 x 9.
This means your answer should be 28.3. Hope this helps! Just a minor mistake (:
The formula for circumference is 2r, where r is equal to radius. It states to use 3.142 for pi It also provides you with the diameter, not the radius, so you have to divide it by two to get 4.5 2*3.142*4.5= approximately 28.278 or 28.3
The number of two of the nine members of ski patrol unit can be chosen is equal to the combinations of 9 taken 2. This can be calculated using the formula:
