Pi (π) Math Example 1

Follow the full solution, then compare it with the other examples linked below.

Example 1

easy
A circle has a diameter of 10 cm. What is its circumference? Use π≈3.14\pi \approx 3.14.

Solution

  1. 1
    Step 1: The formula for circumference is C=πdC = \pi d, where dd is the diameter.
  2. 2
    Step 2: Substitute the values: C=3.14×10C = 3.14 \times 10.
  3. 3
    Step 3: Calculate: C=31.4C = 31.4 cm.

Answer

C=31.4C = 31.4 cm
Pi (π\pi) is the ratio of a circle's circumference to its diameter — it is always approximately 3.14159, no matter the size of the circle. Multiplying the diameter by π\pi gives the circumference.

About Pi (π)

The ratio of a circle's circumference to its diameter, approximately 3.14159…3.14159\ldots

Learn more about Pi (π) →

More Pi (π) Examples

Example 2 medium

A circle has a radius of 7 m. Find its area. Use [formula].

Example 3 medium

A circular pool has a circumference of 31.4 m. Find its radius and area. Use [formula].

Example 4 easy

A circle's circumference is [formula] cm. What is its diameter? Use [formula].

Example 5 hard

A wheel of radius 0.5 m rolls without slipping. How many full rotations does it make to travel 100 m

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