Area of a Circle

Front

What is the symbol for pi?

Back

π

Front

What is the area of a circle?

Back

The amount of space inside of the circle.

Front

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

Back

A = π·r²

Front

Find the area of a circle with a radius of 7 cm.

Back

A = π·(7)² = 153.94 cm² (approximately)

Front

What does 'r' represent in the area formula A = π·r²?

Back

The radius of the circle.

Front

What is the diameter of a circle?

Back

The distance across the circle through the center, equal to 2 times the radius.

Front

If the radius of a circle is doubled, how does the area change?

Back

The area increases by a factor of four.

Front

What is the relationship between the circumference and area of a circle?

Back

Both are related to the radius, but circumference is linear (C = 2·π·r) while area is quadratic (A = π·r²).

Front

Find the area of a circle with a diameter of 10 cm.

Back

A = π·(5)² = 78.54 cm² (approximately)

Front

What is the approximate value of π?

Back

3.14