Circumference and Area of Circles

Front

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

Back

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

Tags

CCSS.7.G.B.4

Front

What is the relationship between diameter and radius?

Back

Diameter is twice the radius. (Diameter = 2 × radius)

Tags

CCSS.7.G.B.4

Front

If the radius of a circle is 5 inches, what is the circumference?

Back

Circumference = 2 × π × 5 = 31.4 inches (using π = 3.14).

Tags

CCSS.7.G.B.4

Front

What is the area of a circle?

Back

Area = π × radius².

Tags

CCSS.7.G.B.4

Front

If the radius of a circle is 3 cm, what is the area?

Back

Area = π × 3² = 28.26 cm² (using π = 3.14).

Tags

CCSS.7.G.B.4

Front

What does 'diameter' mean?

Back

Diameter is a line segment that passes through the center of the circle and touches both edges.

Front

What is a 'chord' in a circle?

Back

A chord is a line segment whose endpoints lie on the circle.

Front

What is the value of π (pi) approximately?

Back

π (pi) is approximately 3.14.

Tags

CCSS.HSG.GMD.A.1

Front

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

Back

Diameter = Circumference ÷ π.

Tags

CCSS.7.G.B.4

Front

If a circle has a circumference of 31.4 inches, what is its diameter?

Back

Diameter = 31.4 ÷ 3.14 = 10 inches.

Tags

CCSS.7.G.B.4