Circumference of a Circle Warmup

Front

What is the formula for the circumference of a circle?

Back

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

Tags

CCSS.7.G.B.4

Front

What is the value of pi (π) used in calculations?

Back

3.14.

Tags

CCSS.HSG.GMD.A.1

Front

What does the term 'circumference' refer to in geometry?

Back

The distance around a circle.

Front

If the diameter of a circle is 10 cm, what is the circumference?

Back

31.4 cm (using π = 3.14).

Tags

CCSS.7.G.B.4

Front

What is the relationship between diameter and radius?

Back

The radius is half of the diameter.

Tags

CCSS.7.G.B.4

Front

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

Back

Radius = Circumference / (2 × π).

Tags

CCSS.7.G.B.4

Front

What is the diameter of a circle with a radius of 5 cm?

Back

10 cm.

Tags

CCSS.7.G.B.4

Front

If a circle has a circumference of 62.8 cm, what is its radius?

Back

10 cm (using π = 3.14).

Tags

CCSS.7.G.B.4

Front

What is the area of a circle with a radius of 7 cm?

Back

Area = π × radius² = 153.86 cm² (using π = 3.14).

Tags

CCSS.7.G.B.4

Front

What is the circumference of a circle with a radius of 12.5 cm?

Back

78.5 cm (using π = 3.14).

Tags

CCSS.7.G.B.4