Answer:
6.28 mm
Step-by-step explanation:
We have been given the diameter of circle shape necklace
[tex]Radius=\frac{diameter}{2}[/tex]
[tex]Radius=\frac{4}{2}=2[/tex]
So, the radius of circle shape necklace is 2mm
Using the formula for circumference which is:[tex]2\pi\cdot r[/tex]
Circumference of necklace of circle shaped is:
[tex]2\cdot3.14\cdot2[/tex]
[tex]\Rightarrow 12.56mm[/tex]
And as we are given that the circumference of of the earrings is one-half the circumference of the necklace.
Hence, the the circumference of the circle-shaped part of one of the earrings:
[tex]\frac{1}{2}\cdot 12.56[/tex]
[tex]\Rightarrow 6.28[/tex]
