There are 30 questions about the circumference and their answers in grade six. The relevant contents are as follows:

1. The diameter of a circle is14cm. Find its circumference.

Answer: circumference = π× diameter = π × 14 = 44 cm (π is 3. 14).

The radius of a circle is 8 cm. Find its circumference.

Answer: perimeter = 2 × π × radius = 2× π× 8 = 16π ≈ 50.24cm (π is 3. 14).

The diameter of a circle is 20cm. Find its circumference.

Answer: circumference = π× diameter = π × 20 = 62.8 cm (π is 3. 14).

4. The radius of a circle is 15m. Find its circumference.

Answer: perimeter = 2 × π × radius = 2× π× 15 = 30 π ≈ 94.2m (π is 3. 14).

5. Given that the circumference of a circle is 36π meters, find its radius.

Answer: perimeter = 2 × π × radius, so 36π = 2 × π × radius, radius = 36 π/(2× π) = 18m.

6. The circumference of a circle is 66 cm. Find its diameter.

Answer: perimeter = π× diameter, so 66 = π × diameter, and diameter = 66/π ≈ 2 1.02 cm (π is 3. 14).

These are all basic calculation problems about the circumference. You can create more questions according to the forms and answers of these questions.

Circumference refers to the length on the boundary of a circle. It is equal to the diameter of a circle multiplied by pi. The formula is perimeter = π× diameter, which can also be expressed as 2 × π ×.

Radius. In mathematics, π is an infinite acyclic decimal, which is about 3. 14. So the circumference of a circle can be calculated by the product of diameter or radius and pi, which is the total length of a curve around the circle.