Area and Circumference

Front

What is the diameter of a circle?

Back

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

Tags

CCSS.HSG.C.A.2

Front

What is the formula for the area of a circle?

Back

Area = πr², where r is the radius.

Tags

CCSS.7.G.B.4

Front

What is the formula for the circumference of a circle?

Back

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

Tags

CCSS.7.G.B.4

Front

If a circle has a radius of 5 inches, what is its diameter?

Back

The diameter is 10 inches.

Tags

CCSS.7.G.B.4

Front

What is the circumference of a circle with a diameter of 16 inches?

Back

Circumference = πd = π(16) ≈ 50.27 inches.

Tags

CCSS.7.G.B.4

Front

How do you find the area of a circle with a radius of 7 inches?

Back

Area = π(7)² ≈ 153.94 square inches.

Tags

CCSS.7.G.B.4

Front

What is the relationship between diameter and radius?

Back

The diameter is twice the radius (d = 2r).

Tags

CCSS.7.G.B.4

Front

If the circumference of a circle is 31.4 inches, what is the radius?

Back

Radius = Circumference / (2π) ≈ 5 inches.

Tags

CCSS.7.G.B.4

Front

What is the area of a circle with a radius of 10 inches?

Back

Area = π(10)² ≈ 314.16 square inches.

Tags

CCSS.7.G.B.4

Front

What does π (pi) represent in circle calculations?

Back

π is a constant approximately equal to 3.14, representing the ratio of the circumference to the diameter of a circle.

Tags

CCSS.HSG.GMD.A.1