Best Answer

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)

Study guides

☆☆

Q: What is the area of a circle if it has a diameter which is 18 feet long?

Write your answer...

Submit

Still have questions?

Continue Learning about Geometry

The area is 201.1 square inches.

It's an area of exactly 600,000 square feet. How 'big' it is depends on how it's shaped. -- If it's a square, then each side of the square is about 775 feet long. -- If it's a circle, then the diameter (distance across) of the circle is about 874 feet. -- If it's a rectangle 1 foot wide, then it's about 114 miles long. It all depends on the shape.

This cannot be answered without knowing the shape of the area. If the shape is a square, each side would be 293.4 feet long and the perimeter of the area would be 1,173.6 feet around. If the area is a circle, the distance around the outside of the circle (circumference) would be 1,040 feet.

The diameter is twice as long as the radius. d = 2r The diameter is basically a line through the center of a circle while a radius is from the center to the circumference of a circle.

32"

Related questions

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 circumference of a circle if the diameter is 10 feet long is: Pi x 10 (about 31.416).

A cylinder 10 feet in diameter by 75 feet long has a surface area of 2,513.3 square feet.

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.

The area is 201.1 square inches.

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 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.

10 ft

using area = pi *r^2 we get: 314.1592654

1 acre = 43,560 square feet. It can be any shape, as long as the enclosed area is 43,560 square feet. If it's square, then each side of the square is 208.71 feet long. If it's a circle, then the diameter of the circle is 235.50 feet. If the acre is in a rectangle 1 foot wide, then the rectangle is 8.25 miles long.

The circumference is easy to calculate: diameter x Pi (about 3.1416) = circumference. So,10 feet x 3.1416 = 31.416 feet circumference.

People also asked