ALG I Circumference and Area of A Circle

Front

What is the formula for the circumference of a circle?

Back

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

Front

What is the formula for the area of a circle?

Back

A = πr², where A is area and r is radius.

Front

If a circle has a diameter of 10 meters, what is its radius?

Back

5 meters.

Front

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

Back

43.98 cm (C = 2πr).

Front

What is the diameter of a circle with a radius of 12 m?

Back

24 m.

Front

What is a chord in a circle?

Back

A chord is a line segment with both endpoints on the circle.

Front

What is the relationship between diameter and radius?

Back

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

Front

What is the circumference of a circle with a diameter of 8 m?

Back

25.12 m (C = πd).

Front

What is the radius of a circle with an area of 50.24 cm²?

Back

4 cm (A = πr²).

Front

What is a sector of a circle?

Back

A sector is a portion of a circle enclosed by two radii and an arc.