CIRCUMFERENCE AND AREA OF CIRCLE PRACTICE

Front

What is the definition of diameter in a circle?

Back

The diameter is the distance across a circle through its center, equal to twice the radius.

Front

What is the definition of radius in a circle?

Back

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

Front

What does the symbol π (pi) represent?

Back

Pi (π) is a mathematical constant approximately equal to 3.14, representing the ratio of the circumference of a circle to its diameter.

Front

What is the formula for calculating the circumference of a circle?

Back

C = π·d, where C is the circumference and d is the diameter.

Front

What is the formula for calculating the area of a circle?

Back

A = π·r², where A is the area and r is the radius.

Front

If the radius of a circle is 7 cm, what is the diameter?

Back

The diameter is 14 cm (diameter = 2 × radius).

Front

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

Back

The radius is 5 cm (radius = diameter / 2).

Front

What is the circumference of a circle with a diameter of 8 cm?

Back

The circumference is approximately 25.12 cm (C = π·d = π·8).

Front

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

Back

The area is approximately 28.27 cm² (A = π·r² = π·3²).

Front

How do you find the circumference if you only know the radius?

Back

Use the formula C = 2·π·r, where r is the radius.