Sydney drew a scale diagram of a circular fire pit in the centre of a circular patio with an actual circumference of 15 m. The circle containing the fire pit is a reduction of the circular patio, by a scale factor of . (Circumference = n > diameter) a. Determine the diameter of the actual fire pit, to the nearest hundredth of a metre. b. What is the diameter of the fire pit in the scale diagram if the scale factor used was C. After construction, the raised fire pit will have a surface area of 6.47 m'. What will be the surface area of a similar fire pit that is enlarged by a scale factor of 3