Geometry SOL Review G.11 - Circles

Front

What is the definition of a circle?

Back

A circle is a shape consisting of all points in a plane that are a fixed distance (radius) from a center point.

Front

What is the formula for the circumference of a circle?

Back

The circumference C of a circle is given by the formula C = 2πr, where r is the radius.

Front

What is 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

What is a semicircle?

Back

A semicircle is half of a circle, formed by cutting a whole circle along its diameter.

Front

How do you find the radius of a circle if you know the diameter?

Back

The radius r is half of the diameter d, so r = d/2.

Front

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

Back

The diameter d of a circle is twice the radius r, so d = 2r.

Front

What is the definition of a chord in a circle?

Back

A chord is a line segment whose endpoints lie on the circle.

Front

What is the definition of a tangent to a circle?

Back

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

Front

What is the central angle of a circle?

Back

A central angle is an angle whose vertex is at the center of the circle and whose sides are radii.

Front

What is the formula for the area of a semicircle?

Back

The area A of a semicircle is given by the formula A = (1/2)πr².