circumference of a half dollar?

Assuming you mean the US half dollar coin, which has a diameter of 1.205 inches (30.61 mm)

Circumference = pi * diameter
Circumference = 1.205π in ≈ 3 13/16 in (to the nearest 16th of an inch)
Circumference = 30.61π mm ≈ 96.16 mm (2 dp)

circumference of a half dollar

use a ruler … find the distance from one side to the other … this is the diameter
circum. = pi X diameter <<< so just multiply according to google the diameter is 1.205 inches so the circumference = 3.7856 inches

96. 16 mm

C = πd

C = (3.061 cm)π

This is as far as you could go with this, unless you just wanted a numerical approximation like so:

C ≈ 9.616 cm

There you have it. If you want it in inches instead (9.616/2.54) then you will have:

C ≈ 3.79 inches

Answer 6

I would say about $1.25