Circles Test Review

Front

What is the formula for the circumference of a circle?

Back

C = 2πr, where C is the circumference and r is the radius.

Front

What is the value of π (pi) rounded to two decimal places?

Back

π ≈ 3.14

Front

If the radius of a circle is 5 m, what is the circumference?

Back

C = 2π(5) ≈ 31.4 m.

Front

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

Back

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

Front

What is the area of a circle?

Back

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

Front

If the circumference of a circle is 31.4 m, what is the radius?

Back

r = C / (2π) ≈ 5 m.

Front

What is the central angle of a circle?

Back

An angle whose vertex is at the center of the circle and whose sides intersect the circle.

Front

What is a chord in a circle?

Back

A line segment whose endpoints lie on the circle.

Front

What is a tangent to a circle?

Back

A line that touches the circle at exactly one point.

Front

What is the relationship between a tangent and a radius at the point of contact?

Back

The tangent is perpendicular to the radius at the point of contact.