Ch 10 Circles

Front

What is a circle?

Back

A circle is a set of points in a plane that are equidistant from a fixed point called the center.

Front

What is the radius of a circle?

Back

The radius is the distance from the center of the circle to any point on its circumference.

Front

What is the diameter of a circle?

Back

The diameter is twice the length of the radius and is the longest distance across the circle.

Front

What is the equation of a circle in standard form?

Back

The standard form of a circle's equation is (x-h)² + (y-k)² = r², where (h,k) is the center and r is the radius.

Front

How do you find the circumference of a circle?

Back

The circumference C of a circle can be found using the formula C = 2πr, where r is the radius.

Front

What is a tangent line to a circle?

Back

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

Front

What is the relationship between a tangent and a radius?

Back

A tangent to a circle is perpendicular to the radius drawn to the point of tangency.

Front

How do you find the area of a circle?

Back

The area A of a circle can be calculated using the formula A = πr², where r is the radius.

Front

What is the chord of a circle?

Back

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

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.