Circle introduction

Front

What is the center of a circle?

Back

The center of a circle is the point that is equidistant from all points on the circle. It is often labeled as 'O'.

Front

What is the formula to find the diameter of a circle?

Back

The diameter is twice the length of the radius. Formula: Diameter = 2 x Radius.

Front

If the radius of a circle is 5 inches, what is the diameter?

Back

10 inches.

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

If the diameter of a circle is 30ft, what is the radius?

Back

15ft.

Front

What is a diameter in a circle?

Back

A diameter is a straight line that passes through the center of the circle and touches two points on its circumference.

Front

How do you find the circumference of a circle?

Back

Circumference = π x Diameter or Circumference = 2 x π x Radius.

Front

What is the relationship between radius and diameter?

Back

The diameter is always twice the length of the radius.

Front

What is the circumference of a circle with a radius of 4 inches?

Back

Approximately 25.12 inches (Circumference = 2 x π x 4).

Front

What does 'π' represent in circle calculations?

Back

π (pi) is a mathematical constant approximately equal to 3.14, used to calculate circumference and area of circles.