Tangent Lines and Circles

Front

What is a tangent line?

Back

A tangent line is a straight line that touches a circle at exactly one point, known as the point of tangency.

Front

What is 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 diameter?

Back

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

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

How do you calculate the perimeter of a circle?

Back

The perimeter (circumference) of a circle is calculated using the formula C = 2πr, where r is the radius.

Front

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

Back

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

Front

What is a secant line?

Back

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

Front

If a circle has a radius of 7 cm, what is its diameter?

Back

The diameter is 14 cm, calculated as D = 2r.

Front

What is the formula for the area of a circle?

Back

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

Front

If the diameter of a circle is 10 cm, what is the radius?

Back

The radius is 5 cm, calculated as r = D/2.