Help please please explain how do solve this

Mary wants to attach a string of beads along the circular bottom edge of the lamp shade. The diameter of the bottom of the lamp shade is 8 centimeters. How long should Mary make the string of beads?
Use 3.14 for pi.
A) 24 cm
B) 12.56 cm
C) 50.24 cm
D) 25.12 cm

Question

Help please please explain how do solve this 

Mary wants to attach a string of beads along the circular bottom edge of the lamp shade. The diameter of the bottom of the lamp shade is 8 centimeters. How long should Mary make the string of beads? 
Use 3.14 for pi.
A) 24 cm
B) 12.56 cm
C) 50.24 cm
D) 25.12 cm

welshfella · Answer

2 * 3.14 * radius of bottom of lampshade
radius = 1/2of the diameter