Area and Circumference Flashcard

Front

What is the definition of a radius in a circle?

Back

The radius is the distance from the center of the circle to any point on its circumference.

Front

What is the definition of a diameter in a circle?

Back

The diameter is the distance across the circle through its center, equal to twice the radius.

Front

If the diameter of a circle is 70 m, what is the radius?

Back

35 m

Front

What is the formula for calculating the circumference of a circle?

Back

Circumference = π × diameter or Circumference = 2 × π × radius.

Front

If the radius of a circle is 9 meters, what is the circumference using π = 3?

Back

56.52 meters

Front

What is the relationship between radius and diameter?

Back

The diameter is twice the length of the radius.

Front

If a circle has a radius of 20 ft, what is its diameter?

Back

40 ft

Front

What is the circumference of a circle with a radius of 5 cm using π = 3?

Back

30 cm

Front

How do you find the radius if you know the circumference?

Back

Radius = Circumference / (2 × π).

Front

What is the circumference of a circle with a diameter of 10 m using π = 3?

Back

30 m