Area of Circles

Front

What is the area of a circle?

Back

The area of a circle is the space contained within its circumference, calculated using the formula A = πr², where r is the radius.

Front

What does 'radius' mean?

Back

The radius is the distance from the center of the circle to any point on its circumference.

Front

What is 'π' (pi)?

Back

π (pi) is a mathematical constant approximately equal to 3.14, used in calculations involving circles.

Front

How do you find the area of a circle with a radius of 5?

Back

Using the formula A = πr², the area is A = π(5)² = 25π, approximately 78.5.

Front

What is the area of a circle with a radius of 3?

Back

Using the formula A = πr², the area is A = π(3)² = 9π, approximately 28.3.

Front

What is the formula for the area of a circle?

Back

The formula for the area of a circle is A = πr².

Front

If the radius of a circle is doubled, what happens to the area?

Back

If the radius is doubled, the area increases by a factor of four.

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

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

Back

The diameter is found by multiplying the radius by 2: Diameter = 2r.

Front

What is the area of a circle with a radius of 1?

Back

Using the formula A = πr², the area is A = π(1)² = π, approximately 3.14.