Measuring Circles Test Review

Front

What is the formula for the area of a circle?

Back

Area = πr², where r is the radius of the circle.

Front

What is the formula for the circumference of a circle?

Back

Circumference = 2πr or Circumference = πd, where r is the radius and d is the diameter.

Front

What does the term 'circumference' refer to in relation to a circle?

Back

Circumference is the distance around the circle.

Front

What does the term 'area' refer to in relation to a circle?

Back

Area is the amount of space inside the circle.

Front

If a circle has a radius of 3 units, what is its area?

Back

Area = π(3)² = 9π square units.

Front

If a circle has a diameter of 10 units, what is its circumference?

Back

Circumference = πd = π(10) = 10π units.

Front

How is the circumference of a circle related to its diameter?

Back

The circumference is always proportional to the diameter; specifically, C = πd.

Front

What is the relationship between radius and diameter?

Back

The diameter is twice the radius; d = 2r.

Front

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

Back

Area = π(5)² = 25π square units.

Front

What is the circumference of a circle with a radius of 4 units?

Back

Circumference = 2π(4) = 8π units.