GEO #6 Circles A Circumference, Area, Equations

Front

What is the formula for the area of a circle?

Back

Front

What is the formula for the circumference of a circle?

Back

Front

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

Back

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

Front

Define a tangent line in relation to a circle.

Back

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

Front

What is a secant line?

Back

A secant line is a line that intersects a circle at two points.

Front

What is a chord in a circle?

Back

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

Front

What is a central angle?

Back

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

Front

What is a semicircle?

Back

A semicircle is an arc that has endpoints on the diameter and measures 180°.

Front

How do you find the area of a circle if the radius is known?

Back

Front

What is the circumference of a circle with a radius of 5 cm?

Back