Zachary attaches his A+test to the refrigerator with a circular magnet. Out of curiosity, he measures the magnet and calculates that it has a diameter of 4 centimeters. What is the magnet's circumference

Solution

Z a c ha ry a tt a c h es hi s A + t es t t o t h e re f r i g er a t or w i t h a c i rc u l a r ma g n e t . O u t o f c u r i os i t y, h e m e a s u res t h e ma g n e t an d c a l c u l a t es t ha t i t ha s a d iam e t er o f 4 ce n t im e t ers . Wha t i s t h e ma g n e t^{'} s c i rc u m f ere n ce

c i rc u m f ere n ce : 4 π c m

Decimal

12.56637 \dots

Solution steps

Given:

d iam e t er : 4 c m

Circle circumference given

d = 4 : C = 4 π

c i rc u m f ere n ce : 4 π c m