Exploring Adding and Subtracting Rational Expressions

What is the formula for the circumference of a circle?

• C = 2r

• C = πr^2

• C = πd

• C = 2πr

If the radius of a circle is 15 cm, what is the diameter?

• 30 cm

• 45 cm

• 7.5 cm

• 15 cm

How do you calculate the area of a circle?

• A = 2πr

• A = πr^2

• A = r^2

• A = πr

What is the area of a circle with a radius of 12 inches?

• 452.16 in²

• 904.32 in²

• 226.08 in²

• 150 in²

What is the circumference of a wheel with a diameter of 30 inches?

• 60 inches

• 120 inches

• 45 inches

• 94.2 inches

How far does a unicycle travel in 29 revolutions if the wheel diameter is 30 inches?

• 1455.9 inches

• 2731.8 inches

• 5463.6 inches

• 1827.9 inches

What is the diameter of a tire if the circumference is given as 32π inches?

• 48 inches

• 32 inches

• 64 inches

• 16 inches

If the area of a circle is 452.16 in², what is the radius?

• 12 inches

• 24 inches

• 6 inches

• 18 inches

For a circle with an area of 78.5 in², what is the diameter?

• 15 inches

• 20 inches

• 5 inches

• 10 inches

What is the area covered by a sprinkler if it can spray up to 15 feet?

• 1962.5 ft²

• 1413 ft²

• 353.25 ft²

• 706.5 ft²