Circumference/area/arc length/sector area Review

Front

What is the formula for the area of a circle?

Back

Area = πr², where r is the radius of the circle.

Front

What is the formula for the circumference of a circle?

Back

Circumference = 2πr or Circumference = πd, where d is the diameter.

Front

What is arc length in a circle?

Back

Arc length is the distance along the curved line of a circle's arc.

Front

How do you calculate the area of a sector?

Back

Area of a sector = (θ/360) × πr², where θ is the angle in degrees and r is the radius.

Front

What is the relationship between diameter and radius?

Back

Diameter = 2 × Radius.

Front

If a circle has a radius of 3 ft, what is its area?

Back

Area = π(3)² = 28.27 ft².

Front

If a circle has a circumference of 31.4 cm, what is its radius?

Back

Radius = Circumference / (2π) = 31.4 / (2π) = 5 cm.

Front

What is the formula for finding the length of an arc?

Back

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

Front

What is the area of a circle with a diameter of 10 m?

Back

Area = π(5)² = 78.54 m².

Front

How do you find the circumference of a circle with a radius of 4 inches?

Back

Circumference = 2π(4) = 25.13 inches.