GEO Ch. 10 TEST Circles

Front

What is the formula for the circumference of a circle?

Back

C = 2πr, where r is the radius.

Front

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

Back

3.14

Front

Define a tangent line in relation to a circle.

Back

A tangent line is a line that touches the circle at exactly one point.

Front

What is the difference between a secant and a chord?

Back

A secant intersects the circle at two points, while a chord is a line segment with both endpoints on the circle.

Front

What is a diameter of a circle?

Back

A diameter is a chord that passes through the center of the circle, dividing it into two equal halves.

Front

How do you find the radius if you know the circumference?

Back

r = C / (2π) where C is the circumference.

Front

What is a semicircle?

Back

A semicircle is half of a circle, formed by a diameter and the arc connecting its endpoints.

Front

What is the relationship between the radius and diameter?

Back

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

Front

If the radius of a circle is 7, what is the circumference?

Back

C = 2π(7) ≈ 43.98.

Front

What is a major arc?

Back

A major arc is an arc that is larger than a semicircle.