Arc Length/Circumference Circles (shortened, round 2DP)

Front

What is the distance around a circle?

Back

Circumference

Front

What is the formula for the circumference of a circle?

Back

C = 2πr or C = πd, where r is the radius and d is the diameter.

Front

What is the arc length of a circle?

Back

The arc length is a portion of the circumference of a circle.

Front

How do you calculate the arc length of a minor arc?

Back

Arc Length = (θ/360) × C, where θ is the central angle in degrees and C is the circumference.

Front

What is the relationship between diameter and radius?

Back

Diameter = 2 × Radius.

Front

If the circumference of a circle is 20π km, what is the diameter?

Back

Diameter = 20 km.

Front

What is the formula for the area of a circle?

Back

Area = πr².

Front

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

Back

Radius = C/(2π).

Front

What is the circumference of a circle with a radius of 6 cm?

Back

C = 2π(6) = 12π cm or approximately 37.70 cm.

Front

If the circumference of a circle is 37.70 cm, what is the radius?

Back

Radius = 37.70/(2π) ≈ 6 cm.