Circumference and Area of Circles

Front

What is the formula for the AREA of a circle?

Back

Front

What is the formula for the CIRCUMFERENCE of a circle?

Back

Front

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

Back

@@A= ext{π} imes (7)^2 \\ A ext{ is approximately } 153.94 ext{ cm}^2.

Front

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

Back

@@C= ext{π} imes 10 \\ C ext{ is approximately } 31.42 ext{ cm}.

Front

What is the relationship between diameter and radius?

Back

Front

How do you convert diameter to radius?

Back

Front

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

Back

@@A= ext{π} imes (5)^2 \\ A ext{ is approximately } 78.54 ext{ cm}^2.

Front

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

Back

@@C=2 ext{π} imes 3 \\ C ext{ is approximately } 18.85 ext{ cm}.

Front

If the area of a circle is 50.27 cm², what is the radius?

Back

@@A= ext{π} imes r^2 \\ r=rac{A}{ ext{π}} \\ r ext{ is approximately } 4.01 ext{ cm}.

Front

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

Back

@@A= ext{π} imes (4)^2 \\ A ext{ is approximately } 50.27 ext{ cm}^2.