Answer:
He used the radius instead the diameter.
Step-by-step explanation:
Mario computes the circumference of his 15” wide bicycle tire as 23.55 inches.
15 inches wide means the diameter is 15 inches. The radius is [tex]15/2=7.5[/tex] inches
And the circumference is found as = [tex]2\pi r[/tex]
Where r is 7.5
The circumference is = [tex]2\times3.14\times7.5=47.1[/tex]inches
But Mario computed is as 23.55, this is half of 47.1
This means he just multiplied pi and 7.5, rather than [tex]2\pi r[/tex].
So, the correct option is : He used the radius instead the diameter.
