Since the total angle measure of a circle is 360 degrees, a 30 degree sector is 30/360=1/12 of the area of the circle. Since the area of the full circle is , the area of the sector is square centimeters. Hope this helps!
It is given that the cost of renting a car is a flat rate of $45 per day plus $0.25 for each mile you drive. So cost as a function of distance traveled is