Area = (pi) R2
25 pi = pi R2
R2 = 25
R = 5 cm
You use the formula: area = pi x radius squared If you approximate pi with 3.14, and replace the square with a product, that becomes: area = 3.14 x radius x radius
Commit to memory the two circle equations C = 2 pi r A = pi r^(2) We required the second eq'n A = pi 10^(2) A = 3.14 X 100 A = 314.00 sq. ft.
Area = pi R2 = 25 pi = 78.54 square centimeters(rounded)
Equation: x^2 +y^2 -10x +6y -15 = 0 Completing the squares: (x-5)^2 +(y+3)^2 -25 -9 -15 = 0 So: (x-5)^2 +(y+3)^2 = 49 which is the radius of the circle squared Area of the circle: 49*pi = 154 square units rounded to the nearest integer
64 pi ie just over 201 sq cm
The area of a circle is equal to pi times the radius squared. So in your case it would be 5 squared, (25) times pi which is equal to ~78.5
area equals pi r squared therefor r squared equals area over pi. Now find square root of r squared and you have "R" (radius) = 2.821
The area would be 78.53 squared inches. Formula: PI (x) Radius squared = Area Radius is half of the diameter of the circle. So the radius is 5 Inches. (10 divided by 2 = 5) 3.14 x 5 squared = Area ---> 3.14 x 25 = 78.53981634 Hope that helped
A circle with a radius of 25 cm has an area of 1,963.5 square cm.
The circumference of a circle that has an area of 25 centimeters squared is about 17.72 cm
Formula for finding the area of a circle = pie times the radius squared ( 3.14 x 52 ) 3.14 x 25 = 78.5 (do not forget the units whether it be centimeters, inches, etc. they are squared as well. i.e. 78.5 cm2)
The area of a circle is PI times the radius of the circle squared. The radius of a one foot diameter circle it 1/2 or .5 feet. .5 squared is .25 PI is 3.1416 3.1416 times .25 = .79 square feet So, there are about .8 square feet in a 1 foot diameter circle.
Area variesa s pi times the radius squared. 15/3 = 5; 5 squared = 25 A radius of 15 miles grows the area 25 times
Area = Pi(r)2 - A circle with a radius of 25 inches has an area of 1,963.5 square inches.
Equations of circles are usually in x2+y2=(radius)2 form, so if you have x2 + y2 = 25 x2 + y2 = 52 then radius = 5.
Half the diameter then multiply the radius (your new measurement) by itself. E.g Diameter is 10 what is the area? 10 divided by 2 is 5 which is the radius. Multiply the 5 by itself. 52=25 then multiply the squared radius (25) by Pi.
If you mean area of a circle with a radius of 25 cm then it is:- Area = pi*252 = 1963.495 square cm to 3 decimal places