Formulae
What is the circumference of a circle?
2 pi r or pi d
The circumference of a circle with a diameter of 9 cm (to 2 decimal places)
28.27 cm
The diameter of a circle with a radius of 15 cm
30 cm
The surface area of a cylinder with a radius of 5 cm and a height of 2 cm (to 1 decimal place)
219.9 square centimetres
Volume formula for a cylinder
V = pi(r)squared times h?
What is the area of a circle?
pi x r^2
The area of a circle with a radius of 9 ft (to 2 decimal places)
254.34 ft-squared
The radius of a circle with a circumference of 37 cm (to 1 decimal place)
5.9 cm
The surface area of a cylinder with a radius of 4.9 in and height of 8.2 (to 1 decimal place)
403.3 square inches
Volume of a cylinder with a radius of 5 cm and a height of 12.2 cm (to 1 decimal place)
958.2 cubic centimetres
What is the volume of a cylinder?
pi x r^2 x h
The area of a circle with a diameter of 12.6 m (to 1 decimal place)
498.5 meters-squared
A machine makes circular paper plates of circumference 50 cm. Find to 1 decimal place the diameter of the plates.
15.9 cm
The surface area of a cylinder with a diameter of 13 ft and height 40 feet (to nearest whole number)
4329 feet-squared
The volume of a cylinder with a diameter of 52.4 in and a height of 36.9 in (to the nearest whole number)
79 575 cubic inches
x/360 x pi x r^2
The perimeter of a semi-circle with radius of 6 cm (to 2 decimal places)
30.85 cm
A wagon wheel has a circumference of 1 meter. Find to 1 decimal place the radius of the wagon wheel.
15.9 cm
The lateral surface area of a cylinder with a radius of 4 cm and a height of 10 cm (to the nearest whole number)
251 square centimeters
Volume of a cylinder with a radius of 3 ft and a height of 12 ft (to the nearest whole number)
339 cubic feet
What is the circumference of a sector?
x/360 x 2 x pi x r + 2r
The area of a quarter circle with a radius of 3 mm (to 1 decimal place)
7.1 mm-squared
A dinner plate has an area of 113.1 square inches. Calculate the diameter of the plate, correct to the nearest inch.
12 inches
The lateral surface area of a cylinder with a radius of 45 feet and a height of 11 feet (to the nearest whole number)
3110 square feet
Volume of half a cylinder with a diameter of 16 mm and a height of 25 mm (to the nearest whole number)
2513 cubic millimeters