2. if the diameter of a circle changes from 5 cm to 15 cm, how will the circumference change? a. multiplies by 1/3 b. multiplies by 3 c. increases by 10 d. decreases by 10 5. given a circle with a circumference of 33 cm, find the radius. a. 3.24 b. 5.25 c. 6.48 d. 10.50 8. a circle has an area of 36 inches squared. what is the area of a sector of the circle that had a central angle of 30 degrees? show all work!with the above questions(also there is one attached).