Question

The distance around a circle and the distance across a circle are related.

Distance Around the Circle:
Button : _______ ________ ________
Disk: ________ ________ __________
Dartboard: ________ ________ ________


Distance Across The Circle:
Button : _______ ________ ________
Disk: ________ ________ __________
Dartboard: ________ ________ ________



B. Use the string and a ruler to measure the distance across the circle and the distance around the circle. Complete the table. Round each measurement to the neareast quarter inch.

A blank table is shown with two rows labeled "Distance Around the Circle" and "Distance Across the Circle" and three columns labeled "Button", "Disk" and "Dartboard".
A CD, a button and a dartboard are shown.

Answer 1

What you need to do
- Use a piece of string to wrap once around each object to get the distance around (circumference). Cut or mark the string where it meets. Then straighten the string and measure its length with a ruler.
- Measure the distance across each object by placing the ruler straight across the middle (through the center) — that is the diameter.
- Round each measurement to the nearest quarter inch (0.00, 0.25, 0.50, 0.75).

Quick rounding rule to nearest quarter inch
- Look at the hundredths: .00–.12 → .00, .13–.37 → .25, .38–.62 → .50, .63–.87 → .75, .88–.99 → round up to next whole inch.

Relationship to check
- Circumference ≈ π × diameter (so the distance around is about 3.14 times the distance across).

Example completed table (use these only if your objects are the typical sizes listed; otherwise measure your own):

Distance Around the Circle:
- Button: 1.5 in
- Disk (CD): 14.75 in
- Dartboard: 56.5 in

Distance Across the Circle:
- Button: 0.5 in
- Disk (CD): 4.75 in
- Dartboard: 18.0 in

Notes
- The disk (CD) diameter used above is 4.724 in (120 mm) and the standard dartboard diameter is 18 in; a small button was assumed 1/2 in across. If your real objects differ, measure them and fill in your own numbers.