PERIOD 4: Area and Circumference Flashcard

Front

What is the formula for the circumference of a circle?

Back

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

Front

What is the value of π (pi) approximately?

Back

π is approximately 3.14.

Front

How do you calculate the area of a circle?

Back

Area = π × radius².

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.

Front

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

Back

Diameter = 2 × radius = 2 × 5 cm = 10 cm.

Front

What is the circumference of a circle with a diameter of 10 cm?

Back

Circumference = π × 10 cm ≈ 31.4 cm.

Front

What is the area of a circle with a radius of 3.5 cm?

Back

Area = π × (3.5 cm)² ≈ 38.48 cm².

Front

If a pizza has a diameter of 16 inches, what is its circumference?

Back

Circumference = π × 16 inches ≈ 50.24 inches.

Front

What is the circumference of a circular table with a radius of 1.5 meters?

Back

Circumference = 2 × π × 1.5 m ≈ 9.42 meters.

Front

What is the area of a circle with a diameter of 14 cm?

Back

Area = π × (7 cm)² ≈ 154 cm².