Circle Area and Circumference Flashcard Week 19

Front

What is the formula for the circumference of a circle?

Back

Circumference = 2 × π × r (where r is the radius) or Circumference = π × d (where d is the diameter).

Tags

CCSS.7.G.B.4

Front

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

Back

π (pi) is approximately 3.14.

Tags

CCSS.HSG.GMD.A.1

Front

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

Back

Circumference = π × d = 3.14 × 10 = 31.4 cm.

Tags

CCSS.7.G.B.4

Front

What is the formula for the area of a circle?

Back

Area = π × r² (where r is the radius).

Tags

CCSS.7.G.B.4

Front

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

Back

Area = π × r² = 3.14 × (3)² = 28.26 cm².

Tags

CCSS.7.G.B.4

Front

What is the relationship between diameter and radius?

Back

Diameter = 2 × Radius.

Tags

CCSS.7.G.B.4

Front

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

Back

Radius = Circumference / (2 × π).

Tags

CCSS.7.G.B.4

Front

What is the area of a semicircle with a radius of 2 inches?

Back

Area = (1/2) × π × r² = (1/2) × 3.14 × (2)² = 6.28 in².

Tags

CCSS.7.G.B.4

Front

If a circular garden has a circumference of 62.8 meters, what is its diameter?

Back

Diameter = Circumference / π = 62.8 / 3.14 = 20 meters.

Tags

CCSS.7.G.B.4

Front

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

Back

Circumference = 2 × π × r = 2 × 3.14 × 5 = 31.4 cm.

Tags

CCSS.7.G.B.4