Area, Circumference, and Arc Measure Flashcard

Front

What is the area of a circle with a diameter of 8? Use 3.14 for \(\pi\).

Back

The area is \(\pi r^2 = \pi (4)^2 = 50.24\).

Front

What is the distance around a circle called?

Back

Circumference.

Front

If the circumference of a circle is \(26\pi\) meters, what is the area of the circle?

Back

The area is \(169\pi\) m.

Front

What is the formula for the area of a circle?

Back

The formula is \(\pi r^2\).

Front

Find the area of a circle with a radius of 9. Use 3.14 for \(\pi\).

Back

The area is \(\pi (9)^2 = 254.34\).

Front

What is the formula for the circumference of a circle?

Back

The formula is \(2\pi r\).

Front

What is the radius of a circle with a diameter of 10?

Back

The radius is 5.

Front

If the area of a circle is 78.5, what is the radius? Use 3.14 for \(\pi\).

Back

The radius is 5.

Front

What is the relationship between diameter and radius?

Back

The diameter is twice the radius (d = 2r).

Front

How do you convert diameter to radius?

Back

Divide the diameter by 2.