Area of a Circle and Sector Area

Front

What is the area of a circle?

Back

The space inside the circle.

Front

What is the formula for the area of a circle?

Back

A = πr², where A is the area and r is the radius.

Front

What is the definition of pi?

Back

The ratio of a circle's circumference to its diameter.

Front

What is the area of a quarter circle with radius r?

Back

A = (1/4)πr².

Front

What is the area of a circle with a radius of 13 cm?

Back

530.66 cm².

Front

What is the circumference of a circle?

Back

C = 2πr, where C is the circumference and r is the radius.

Front

How do you find the radius if you know the area of a circle?

Back

r = √(A/π).

Front

What is the area of a circle with a diameter of 10 cm?

Back

A = 25π cm².

Front

What is the area of a sector of a circle?

Back

A = (θ/360) × πr², where θ is the angle in degrees.

Front

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

Back

The area increases by a factor of four.