Finding the Circumference

Front

What is the formula to find the circumference of a circle?

Back

C = π·d, where C is the circumference and d is the diameter.

Front

What does π (pi) approximately equal?

Back

3.14

Front

What is the circumference of a circle with a diameter of 10 cm?

Back

31.4 cm

Front

What does the term 'circumference' refer to?

Back

The distance around a circle.

Front

If the radius of a circle is 5 cm, what is the diameter?

Back

10 cm (Diameter = 2 × Radius).

Front

What is the relationship between diameter and radius?

Back

Diameter is twice the radius (d = 2r).

Front

How do you calculate the circumference if you know the radius?

Back

C = 2πr, where r is the radius.

Front

What is the circumference of a circle with a radius of 4 cm?

Back

25.12 cm (C = 2πr = 2 × 3.14 × 4).

Front

What is the diameter of a circle with a circumference of 31.4 cm?

Back

10 cm (d = C/π).

Front

What is the area of a circle with a radius of 3 cm?

Back

28.26 cm² (Area = πr²).