Pi Day Maths Worksheet - Free Printable

Let’s solve each pie’s circumference step by step.

We are told:
- π = 3.14
- Formula: C = π × d (Circumference = pi times diameter)

We’ll multiply 3.14 by each given diameter to find the circumference.

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Pie 1: d = 7"
C = 3.14 × 7
= 21.98 inches

Pie 2: d = 9"
C = 3.14 × 9
= 28.26 inches

Pie 3: d = 4"
C = 3.14 × 4
= 12.56 inches

Pie 4: d = 6"
C = 3.14 × 6
= 18.84 inches

Pie 5: d = 5"
C = 3.14 × 5
= 15.70 inches

Pie 6: d = 3"
C = 3.14 × 3
= 9.42 inches

Pie 7: d = 10"
C = 3.14 × 10
= 31.40 inches

Pie 8: d = 8"
C = 3.14 × 8
= 25.12 inches

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Now, for the Bonus: Find the radius of each pie.

Remember: Radius = Diameter ÷ 2

So:

- d = 7" → r = 3.5"
- d = 9" → r = 4.5"
- d = 4" → r = 2"
- d = 6" → r = 3"
- d = 5" → r = 2.5"
- d = 3" → r = 1.5"
- d = 10" → r = 5"
- d = 8" → r = 4"

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Final Answer:

Circumferences:
- d=7" → C=21.98"
- d=9" → C=28.26"
- d=4" → C=12.56"
- d=6" → C=18.84"
- d=5" → C=15.70"
- d=3" → C=9.42"
- d=10" → C=31.40"
- d=8" → C=25.12"

Bonus Radii:
- d=7" → r=3.5"
- d=9" → r=4.5"
- d=4" → r=2"
- d=6" → r=3"
- d=5" → r=2.5"
- d=3" → r=1.5"
- d=10" → r=5"
- d=8" → r=4"