A=pi(r)2
A=3.14(7)2
A=3.14(49)
A=153.86 ft2
(Depending on what pi is used, the decimal could change by a few.)
A cylinder 10 feet in diameter by 75 feet long has a surface area of 2,513.3 square feet.
using area = pi *r^2 we get: 314.1592654
The circumference is easy to calculate: diameter x Pi (about 3.1416) = circumference. So,10 feet x 3.1416 = 31.416 feet circumference.
Since radius is half of a diameter, therefore 12 x 2 = 24
The circle's diameter is about 3.97887358 units long.
The area of a circle, if it has a diameter of 13 feet, is: 132.7 square feet.
The area is 201 square feet.
The area of a circle is equal to πr2 where π (pi) is equal to approximately 3.142 and r represents the radius of the circle. Because the question gives you the diameter and not the radius you have to use the measurement of the diameter to calculate the radius. Remember that the radius is equal to half the diameter. So if the diameter is equal to 18 feet, then the radius of this particular circle is equal to 9 feet. Plugging this into our equation for area we get: area = π(92) area = 3.142(81) area = about 254.5 ft2 (don't forget that the answer is in squared feet not just feet)
The circumference of a circle if the diameter is 10 feet long is: Pi x 10 (about 31.416).
The area of a circle is worked out using the formula: area = Pi x (radius x radius) (a.k.a Pi r2 <- sorry, no Pi symbol available. ) The diameter is always twice the radius (the radius is the distance from the edge of the circle to the centre, the diameter is the distance from one edge to the other, through the centre). So, if your circle has a diameter of 16 feet, the radius will be 8 feet. Area = Pi x 82. = Pi x 64. Pi = 3.14159 So... Area = 3.14159 x 64 = 201.1 feet2.
A cylinder 10 feet in diameter by 75 feet long has a surface area of 2,513.3 square feet.
The central circle of stones is about 30 to 33 meters (100 feet) in diameter, and is part of a larger area about 110 meters (360 feet) across.
Assuming the 15 feet is the diameter of the circle. Formula to find the circumference of the circle is pi x diameter. 15 × 3.14 = 47.1 feet So the rope will be 47.1 feet long.
The area is 201.1 square inches.
10 ft
using area = pi *r^2 we get: 314.1592654
The circumference is easy to calculate: diameter x Pi (about 3.1416) = circumference. So,10 feet x 3.1416 = 31.416 feet circumference.