Unit 7 Circles Retest

Front

What is the diameter of a circle?

Back

The diameter of a circle is the distance across the circle through its center, equal to twice the radius.

Front

If the diameter of circle C is 18, what is the radius?

Back

The radius is half of the diameter, so the radius is 9.

Front

What is the formula for the circumference of a circle?

Back

The circumference C of a circle is given by the formula C = πd, where d is the diameter.

Front

Calculate the circumference of a circle with a diameter of 50 ft (use π = 3.14).

Back

C = πd = 3.14 * 50 = 157 ft.

Front

What is the relationship between the diameter and the radius of a circle?

Back

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

Front

How do you calculate the length of an arc in a circle?

Back

The length of an arc can be calculated using the formula: Arc Length = (θ/360) * C, where θ is the angle in degrees and C is the circumference.

Front

What is the formula for the area of a circle?

Back

The area A of a circle is given by the formula A = πr², where r is the radius.

Front

If a circle has a radius of 10 ft, what is its area? (use π = 3.14)

Back

A = πr² = 3.14 * (10)² = 314 ft².

Front

What is the definition of a chord in a circle?

Back

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

Front

What is the definition of a sector in a circle?

Back

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