Circles: Parts, Circumference, Area, Measure and Length

Front

What is an Inscribed Angle?

Back

An inscribed angle is formed by two chords in a circle which have a common endpoint. The vertex of the angle is on the circle, and the sides of the angle are the chords.

Front

What is the formula for the circumference of a circle?

Back

The circumference (C) of a circle can be calculated using the formula C = πd, where d is the diameter of the circle.

Front

What is 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 of the circle.

Front

What is a chord in a circle?

Back

A chord is a line segment with both endpoints on the circle.

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 a line segment that passes through the center of the circle and has its endpoints on the circle. It is twice the length of the radius.

Front

How do you find the circumference of a circle with a diameter of 56 m?

Back

Using the formula C = πd, the circumference is approximately 175.8 m.

Front

What is the relationship between the radius and diameter?

Back

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

Front

What is the center of a circle?

Back

The center is the point that is equidistant from all points on the circumference of the circle.

Front

What is a secant line?

Back

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