Step-by-step explanation:
The circumference of Carlos' head is 22 inches. He want to but a cap. He must know the size of the cap. The formula of circumference of circular shaped object is given by :
[tex]C=2\pi r[/tex]
r is radius of cap
[tex]r=\dfrac{C}{2\pi}\\\\r=\dfrac{22}{2\pi}\\\\r=3.5\ \text{inches}[/tex]
or
Diameter of cap, D = 2 r = 7 inches
So, he must buy a cap that have diameter of 7 inches.
