Calculating Circumference

Front

What is the formula for calculating the circumference of a circle?

Back

C = πD, where C is the circumference and D is the diameter.

Front

What is the value of π (pi) used in calculations?

Back

π is approximately 3.14.

Front

How do you calculate the diameter of a circle if you know the radius?

Back

D = 2r, where D is the diameter and r is the radius.

Front

If a circle has a radius of 18 ft, what is its diameter?

Back

D = 2 * 18 ft = 36 ft.

Front

What is the circumference of a circle with a diameter of 12 ft?

Back

C = πD = 3.14 * 12 ft = 37.68 ft.

Front

How do you find the circumference of a circle using the radius?

Back

C = 2πr, where r is the radius.

Front

What is the circumference of a circle with a radius of 5 cm?

Back

C = 2π * 5 cm = 10π cm.

Front

If a circle has a diameter of 500 km, what is its circumference?

Back

C = πD = 3.14 * 500 km = 1570 km.

Front

What is the relationship between radius and diameter?

Back

The diameter is twice the radius (D = 2r).

Front

If the circumference of a circle is 31.4 m, what is its diameter?

Back

D = C/π = 31.4 m / 3.14 = 10 m.