Radius or Diameter

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 the distance across the circle, passing through the center, and is twice the length of the radius.

Front

If the radius of a circle is 4 yd, what is the diameter?

Back

The diameter is 8 yd (diameter = 2 x radius).

Front

What is the formula to find the radius if you know the diameter?

Back

Radius = Diameter / 2.

Front

What does 'r' represent in circle geometry?

Back

The letter 'r' represents the radius of a circle.

Front

What does 'd' represent in circle geometry?

Back

The letter 'd' represents the diameter of a circle.

Front

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

Back

The radius is 5 m (radius = diameter / 2).

Front

How do you calculate the circumference of a circle using the radius?

Back

Circumference = 2 x π x radius.

Front

How do you calculate the area of a circle using the radius?

Back

Area = π x radius².

Front

If a circle has a radius of 3 m, what is its area?

Back

The area is approximately 28.27 m² (Area = π x 3²).