i believe that it is 18 if the radius is 9
edit: wrong, area = pi*radius^2
so it's 3.1415926535*81=254.469
A circle with a radius of 9 feet has an area of 254.47 square feet.
The radius is 9 feet.
When you triple the radius of the circle . . . -- The diameter also triples. -- The circumference also triples. -- The area is multiplied by 9 .
The area of a circle is calculated using the formula A = πr^2, where r is the radius of the circle. For a 12-inch circle, the radius is half of the diameter, so the radius is 6 inches. Therefore, the area of the 12-inch circle is A = π(6)^2 = 36π square inches. Similarly, for a 9-inch circle, the radius is 4.5 inches, so the area of the 9-inch circle is A = π(4.5)^2 = 20.25π square inches.
First we have to find the radius: 2*pi*radius = 18*pi Divide both sides by 2*pi to find the radius: radius = 9 inches Area of a circle = pi*radius2 Area = pi*92 = 81pi or 254.4690049 square inches
A circle with a radius of 9 feet has an area of 254.47 square feet.
If you triple the radius of a circle, the area will increase by 9. Area is proportional to the square of the radius.
The area of a circle with a radius of nine centimeters is: 254.5 cm2
Area of a circle of radius r = πr2Area of circle of radius 9 In = π(9)2 = π x 81 , putting value of pi we get= 3.14159625 x 81 = 254.46 sq. In
A circle with a radius of 9 feet has an area of 254.47 square feet.
The radius is 9 inches because area of circle is pi*9 squared = 81pi square inches and the diameter is twice the radius which is 2*9 = 18 inches
The area is 254.47 in2
The radius is 9 feet.
When you triple the radius of the circle . . . -- The diameter also triples. -- The circumference also triples. -- The area is multiplied by 9 .
The answer is 254.469005cm squared
9
The area increases as the square of the radius (or diameter). So if you double the radius you * 4 (quadruple) the area. Treble the radius, you *9 the area.