Circumference and Area

Front

What is the circumference of a circle?

Back

The measurement around the circle.

Front

How do you find the area of a circle?

Back

Area = π × radius².

Front

If the radius is 4 cm, what is the diameter?

Back

Diameter = 2 × radius = 8 cm.

Front

What is the formula for the circumference of a circle?

Back

Circumference = 2 × π × radius.

Front

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

Back

Area = π × (5 cm)² = 78.5 cm².

Front

What does π (pi) represent in circle calculations?

Back

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

Front

What is the relationship between diameter and radius?

Back

Diameter = 2 × radius.

Front

How do you calculate the circumference of a circle with a radius of 10 m?

Back

Circumference = 2 × π × 10 m ≈ 62.83 m.

Front

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

Back

Area = π × (5 cm)² = 78.5 cm².

Front

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

Back

Radius = Circumference / (2 × π) = 5 m.