Arc Length/Circumference Review

Front

What is the formula for the circumference of a circle?

Back

Circumference = 2πr, where r is the radius.

Front

How do you find the arc length of a circle?

Back

Arc Length = (θ/360) * Circumference, where θ is the angle in degrees.

Front

What is the relationship between diameter and radius?

Back

Diameter = 2 * Radius.

Front

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

Back

Radius = 10.

Front

What is the formula for the area of a circle?

Back

Area = πr².

Front

How do you convert circumference to diameter?

Back

Diameter = Circumference / π.

Front

What is the circumference of a circle with a radius of 7 cm?

Back

Circumference = 2π(7) = 14π cm.

Front

If the diameter of a circle is 12 cm, what is its circumference?

Back

Circumference = π * 12 = 12π cm.

Front

What is the arc length of a circle with a radius of 5 cm and an angle of 90 degrees?

Back

Arc Length = (90/360) * 2π(5) = (1/4) * 10π = 2.5π cm.

Front

How do you find the angle in degrees if you know the arc length and radius?

Back

Angle (θ) = (Arc Length / Circumference) * 360.