Radius & Diameter
Circumference
Area
Working Backwards
Composite figures
100
What is Radius?
Radius is the distance from the centre of a circle to any point of the circle.
100
What is Circumference?
Circumference is the distance around a circle.
100
What is the formula for area of a circle?
A= pi*r2
100
A bicycle wheel has a radius of 1 foot. If the bicycle wheel rotates one time, what distance is traveled?
What is 2pi or 6.28 feet.
100
Ms. Wilson purchased a welcome mat for her front porch that is a semicircle. The straight side of the mat is 38 inches. To the nearest inch, what is the perimeter of the mat?
What is 98 in?
200
What is Diameter?
The distance across a circle measured through its centre.
200
A circle has a diameter of 3 inches. This is the circumference.
What is 9.42?
200
A circle has a diameter of 16. Find the area.
200.96
200
The circumference of a wheel is 113.04 inches. What is the diameter of the wheel?
What is 36 inches?
200
A lawn sprinkler sprays water 7 feet in every direction as it rotates. To the nearest tenth, what is the area of the sprinkled lawn?
What is 153.9 ft2 ?
300
The diameter is 10 meters. Find the radius.
the radius is 5 meters
300
A circle has a diameter of 102.38 inches. What is the circumference?
What is 321.47 inches?
300
A circle has a radius of 50 miles. What is the area of the circle TO THE NEAREST MILE?
What is 7854 mi2.
300
If your circumference is 72.98 what is your radius?
What is 11.62?
300
Ms. Arnez has a dining table with a diameter of 4 meters. She places a round tablecloth on the table that has a diameter of 5 meters. What is the area to the nearest tenth of a meter of the part of the tablecloth that will hang down the side of the table?
What is 7.1 ft2?
400
The Diameter is 25 meters. What is the Radius?
The Radius is 12.5 meters.
400
A circle has a radius of 16 feet. Find the Circumference.
100.48 feet
400
A pizza is 16 inches long (diameter). It is cut into 4 pieces. Jane eats 3 of the pieces. What is the area of pizza she is eating?
What is 48 pi in2
400
John owns a circular pool in his back yard. If he swims around the pool, he swims 30pi meters. What is the radius of this circle?
What is 15 meters.
400
A pizza cutter has a diameter of 3 inches. To cut a pizza in half, the cutter makes two complete revolutions. What is the circumference of the pizza? Round to the nearest tenth
What is 18.8 in?
500
The Radius is 81 cm. What is the Diameter?
the Diameter is 162 cm.
500
If the radius is 123.45, this is the circumference.
What is 775.266?
500
If you diameter is 7.35 what is your area?
What is 42.41?
500
What is the radius of a circle with an area of 254.34 square ft?
6pi
.
What is the area?
What is 9 ft.
500
Find the area. Give the approximate answer.
What is 122.1 cm2?