Area and circumference of circle calculator uses radius length of a circle, and calculates the perimeter and area of the circle. It is an online Geometry tool requires radius length of a circle. Learn the relationship between the radius, diameter, and circumference of a circle. If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are … Area of a circle. If you know the radius of a circle, you can use it to find the area of that circle. As you know, [math]A=\pi r^2[/math] where [math]r[/math] is the radius of a circle and [math]A[/math] is its area. Convert radius to circumference, area, diameter. Side of polygon given area. Calculate the ratio of the area of a circle with radius r to the circumference of the circle. Area of a regular polygon. The area of a quarter circle when the radius is given is the area enclosed by a quarter circle of radius r is calculated using Area=(pi*(Radius)^2)/4.To calculate Area of a quarter circle when radius is given, you need Radius (r).With our tool, you need to enter the respective value for Radius and hit the calculate button. where ‘r’ represents radius and ‘d’ represents diameter of a circle. Area of an arch given height and radius. Just plug that value into the formula for the area of a circle and solve. If you're seeing this message, it means we're having trouble loading external resources on our website. If you know the circumference of a circle, the radius can be found using the formula where: C is the circumference of the circle π is Pi, approximately 3.142 If you know the area If you know the area of a circle, the radius can be found using the formula where: A is the area of the circle π is Pi, approximately 3.142 Calculator The number [math]\pi[/math] is known to be an irrational number. Since the radius is a line segment from the center to the circle, and the diameter, d, is a line segment from on side of a circle through the center of a circle and out to the other side of the circle, it follows that a radius is 1 2 a diameter. Write a Python program which accepts the radius of a circle from the user and compute the area. Watch this tutorial to see how it's done! Radius of circle given area. Formula and explanation, description, conversion. Python: Area of a Circle . The area of the circle is the primary determinant for all other properties. View solution The length of an arc of a circle of radius 5 cm subtending a central angle measuring 1 5 ∘ = 1 2 a π . It doesn't matter whether you want to find the area of a circle using diameter or radius - you'll need to use this constant in almost every case. The relationship between radius and diameter is an important one to know when learning to how to calculate the radius. Diameter is the distance across the circle through the center. Here the Greek letter π represents a constant, approximately equal to 3.14159, which is equal to the ratio of the circumference of any circle to its diameter. The diameter of a circle calculator uses the following equation: Area of a circle = π * (d/2) 2. Area of a cyclic quadrilateral. Mathematical, algebra converter, tool online. Area of a circular sector. In geometry, the area enclosed by a circle of radius r is πr2. Area of a quadrilateral. Using this calculator, we will understand methods of how to find the perimeter and area of a circle. 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