Area of a circle

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

What is the formula for the area of a circle?

Back

Area = π × r², where r is the radius.

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

If the radius of a circle is 5 cm, what is the area?

Back

Area = π × (5 cm)² = 78.54 cm² (approximately).

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.

Front

How do you find the circumference of a circle?

Back

Circumference = 2 × π × r, where r is the radius.

Front

What is the relationship between diameter and radius?

Back

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

Front

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

Back

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

Front

What is the area of a circle with a radius of 7 cm?

Back

Area = π × (7 cm)² = 153.86 cm² (approximately).

Front

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

Back

Area = π × (10 cm)² = 314.16 cm² (approximately).