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25.13
The answer depends on whether the 4 foot measure is the radius or the circumference.
Its radius is: 8/2 = 4ft
A circular fountain at a park has a radius of 4ft. The mayor wants to build a fountain that is quadruple the size of the current fountain . Find the length of the radius of a new fountain?
The circumference of a circle can be calculated using the formula ( C = \pi \times d ), where ( d ) is the diameter. If the diameter is 4 feet, the circumference would be ( C = \pi \times 4 ) feet, which is approximately 12.57 feet when using ( \pi \approx 3.14 ).
The area is 9.2376 square feet.
25.12ft
The answer depends on whether the 4 foot measure is the radius or the circumference.
The circumference of the circle that has a diameter of 4 feet is: 12.57 feet
Its radius is: 8/2 = 4ft
A circular fountain at a park has a radius of 4ft. The mayor wants to build a fountain that is quadruple the size of the current fountain . Find the length of the radius of a new fountain?
The circumference of a circle can be calculated using the formula ( C = \pi \times d ), where ( d ) is the diameter. If the diameter is 4 feet, the circumference would be ( C = \pi \times 4 ) feet, which is approximately 12.57 feet when using ( \pi \approx 3.14 ).
The area is 9.2376 square feet.
The surface area of this cylinder is 376.99ft2
The surface area is 377ft2
4*pi = 12.56637061 feet
A round pool with a radius of 9 feet and a depth of 4 feet has a capacity of about 7,615 gallons of water.
I assume that you mean it's 4 ft in diameter, and you want to know the number of Sq Ft in the top. If so, the Area is equal to (Pi) X (Radius squared.) OR Since the Radius of a circle is 1/2 the Diameter ... the answer is [(4/2) X (4/2)] X Pi OR 4 X 3.14159 == 12.56636 Sq Ft