Parts of a Circle and Circumference Review

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 through its center, equal to twice the radius.

Tags

CCSS.HSG.C.A.2

Front

How do you calculate the circumference of a circle?

Back

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

Tags

CCSS.7.G.B.4

Front

What is the relationship between radius and diameter?

Back

The diameter is twice the length of the radius (Diameter = 2 × Radius).

Tags

CCSS.7.G.B.4

Front

If the radius of a circle is 9.5 mm, what is the diameter?

Back

Diameter = 2 × 9.5 mm = 19 mm.

Tags

CCSS.7.G.B.4

Front

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

Back

Circumference = 2 × π × 5 cm ≈ 31.42 cm.

Tags

CCSS.7.G.B.4

Front

What is π (pi)?

Back

π (pi) is a mathematical constant approximately equal to 3.14, representing the ratio of the circumference of a circle to its diameter.

Tags

CCSS.HSG.GMD.A.1

Front

If the diameter of a circle is 10 in, what is the radius?

Back

Radius = Diameter / 2 = 10 in / 2 = 5 in.

Tags

CCSS.7.G.B.4

Front

What is the formula for the area of a circle?

Back

Area = π × radius².

Tags

CCSS.7.G.B.4

Front

What is the circumference of a circle with a diameter of 8 m?

Back

Circumference = π × 8 m ≈ 25.13 m.

Tags

CCSS.7.G.B.4