Radius and 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.

Tags

CCSS.HSG.C.A.2

Front

If the diameter of a circle is 40 ft, what is the radius?

Back

20 ft

Tags

CCSS.7.G.B.4

Front

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

Back

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

Tags

CCSS.7.G.B.4

Front

What does 'circumference' mean?

Back

Circumference is the distance around a circle.

Front

How do you convert diameter to radius?

Back

To convert diameter to radius, divide the diameter by 2.

Tags

CCSS.7.G.B.4

Front

If the radius of a circle is 6 ft, what is the diameter?

Back

12 ft

Tags

CCSS.7.G.B.4

Front

What is the relationship between radius and diameter?

Back

The diameter is always twice the length of the radius.

Tags

CCSS.7.G.B.4

Front

What is π (pi)?

Back

π (pi) is a mathematical constant approximately equal to 3.14, used in calculations involving circles.

Tags

CCSS.HSG.GMD.A.1

Front

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

Back

Circumference = 2 × π × 10 m ≈ 62.8 m.

Tags

CCSS.7.G.B.4