Area of a circle: pi*radius*radius
(6 pi) inches.
28.3
You can multiply them as mixed fractions, or convert both to inches, then divide by 144 (sq in / sq ft). 9 ft = 108 in, add 7 in = 115 in. 3 ft = 36 in, add 6 in = 42 in. Multiply (115 in) x (42 in) = 4830 sq in. Divide by 144 (sq in/sq ft) = 33.541667 sq ft.
6 inches
If 6 inches is the radius, replace it in the formula: A=pi x radius2. If 6 inches is the diameter, divide it by 2 first, to get the radius.
If the area of a circle is about 28 square inches the diameter of the circle is: about 6 inches (5.971).
Assuming that 12" round means a circle with a circumference of 12", its radius would be 12/(2*pi) = 6/pi inches. Its area would, therefore, be pi*(6/pi)2 = 36/pi sq inches. In terms of sq mm, that is 7393 sq mm (to 4 sig figs).
6 inches across
36 sq inches.
9*6 = 54 sq inches
To find the area of a circle, you use the formula A = πr^2, where r is the radius of the circle. In this case, the radius is half of the diameter, so the radius is 3 inches. Plugging this into the formula, we get A = π(3)^2 = 9π square inches. Since π is approximately 3.14, the area is approximately 28.26 square inches.
6 inches across
(6 pi) inches.
28.3
A circle that is 4 feet 6 inches in diameter has an area of: 15.904 square feet.
A=pi X radius squared 3.14 X 9=28.26 sq. inches
6 inches is 1/6 of a yard, so a cubic yard of concrete will cover 6 sq yards = 54 sq ft