Area Circle - notes quiz

What is the formula for area of a circle?

• $C=\pi d$

• $A=r^2d$

• $C=\ 2\pi r$

• $A=\pi r^2$

What does  $r^2$  mean?

• r x 2

• r + 2

• r ...the square does not mean anything

• r x r

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

• Nothing... they both do the same thing

• Area of a circle is finding the outside of a circle while Circumference finds the space on the inside of a circle.

• Circumference is both finding the inside of a circle and the outside of a circle. You don't need the area formula.

• Area formula finds the space of the inside of a circle while circumference finds just the outside (like a fence) of a circle.

What is the ratio of pi?

• diameter divided by circumference

• pi times diameter

• circumference divided by diameter

• diameter times circumference

You are given a circle with a diameter of 12. Can I use 12 for the r?

• No... you have to multiply by 2 to get the r.

• No...you have to divide by 2 to get the r.

• Yes... you are good to go!

Pi is ALWAYS 3 except when there is a griddable response?

• True

• False

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

• 9 m²

• 18 m²

• 27 m²

• 12 m²

Meg has a pretty new circular rug for the entry of her house. The rug has a diameter of 12 feet. What is the area that the rug will cover?

• 36 ft²

• 108 ft²

• 18 ft²

• 216 ft²

A record has a radius of 15 cm. What is the area of the record?

• 675 cm²

• 90 cm²

• 45 cm²

• 225 cm²

What do you call the perimeter of the circle?

• Area

• perimeter

• square

• circumference