Circles - Area and Circumference

Front

What is the formula for the area of a circle?

Back

Area = π * r², where r is the radius.

Front

What is the formula for the circumference of a circle?

Back

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

Front

What does the term 'radius' mean in relation to a circle?

Back

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

Front

What does the term 'diameter' mean in relation to a circle?

Back

The diameter is a line segment that passes through the center of the circle and connects two points on its circumference. It is twice the length of the radius.

Front

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

Back

Radius = Diameter / 2.

Front

What is the relationship between the radius and the diameter of a circle?

Back

The diameter is twice the length of the radius.

Front

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

Back

Area = π * (5)² = 25π ≈ 78.54 square units.

Front

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

Back

Circumference = 2 * π * 5 = 10π ≈ 31.42 units.

Front

If the area of a circle is 50 square units, how do you find the radius?

Back

Use the formula: r = √(Area/π). So, r = √(50/π) ≈ 3.99 units.

Front

What is the space inside a circle called?

Back

The area of the circle.