Area of a Circle

Front

What is the formula for the area of a circle?

Back

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

Front

If the radius of a circle is 7 cm, what is its area?

Back

Area = π(7)² ≈ 153.94 cm².

Front

What is the relationship between diameter and radius?

Back

Diameter = 2 × Radius.

Front

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

Back

Circumference = 2πr = 2π(5) ≈ 31.42 cm.

Front

What is a segment of a circle?

Back

A segment is the area of a circle bounded by a chord and the arc connecting the endpoints of the chord.

Front

What is a sector of a circle?

Back

A sector is the area of a circle bounded by two radii and the arc between them.

Front

How do you convert diameter to radius?

Back

Radius = Diameter / 2.

Front

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

Back

Area = π(5)² = 78.5 cm².

Front

What is the area of a circle with a radius of 10 feet?

Back

Area = π(10)² ≈ 314.16 ft².

Front

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

Back

Area = π(3)² ≈ 28.27 m².