Circumference and Area of Circles

Front

What is the formula for the area of a circle?

Back

Area = πr², where r is the radius of the circle.

Tags

CCSS.7.G.B.4

Front

What is the formula for the circumference of a circle?

Back

Circumference = 2πr or Circumference = πd, where r is the radius and d is the diameter.

Tags

CCSS.7.G.B.4

Front

If the radius of a circle is 7 cm, what is its area?

Back

154 cm² (Area = π(7)² = 154 cm²).

Tags

CCSS.7.G.B.4

Front

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

Back

31.42 m (Circumference = π(10) = 31.42 m).

Tags

CCSS.7.G.B.4

Front

What does the term 'circumference' refer to?

Back

The measurement around the circle.

Front

What does the term 'area' refer to in the context of a circle?

Back

The amount of space inside the circle.

Front

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

Back

Radius = Circumference / (2π).

Tags

CCSS.7.G.B.4

Front

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

Back

Diameter = 2 × Radius.

Tags

CCSS.7.G.B.4

Front

What is the area of a circle with a radius of 5 inches?

Back

78.54 in² (Area = π(5)² = 78.54 in²).

Tags

CCSS.7.G.B.4

Front

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

Back

78.5 mm (Circumference = 2π(12.5) = 78.5 mm).

Tags

CCSS.7.G.B.4