How do you find the area of a circle in Java?

What is parameter in Java?

A parameter is a value that you can pass to a method in Java. Then the method can use the parameter as though it were a local variable initialized with the value of the variable passed to it by the calling method.

What is scanner in Java?

The Java Scanner class is used to collect user input. Scanner is part of the java. util package, so it can be imported without downloading any external libraries. Scanner reads text from standard input and returns it to a program.

How do you compare two numbers in Java?

To compare integer values in Java, we can use either the equals() method or == (equals operator). Both are used to compare two values, but the == operator checks reference equality of two integer objects, whereas the equal() method checks the integer values only (primitive and non-primitive).

How do you get the perimeter of a circle?

Learn that the perimeter of a circle has its own special name, called “circumference.” The symbol is a capital C. It is calculated using the formula Pi x diameter, or 3.14 x d = C. It can also be calculated by Pi x (2 x radius) = C or 3.14 x (2 x r) = C.

What is area formula?

The most basic area formula is the formula for the area of a rectangle. Given a rectangle with length l and width w, the formula for the area is: A = lw (rectangle). … As a special case, as l = w in the case of a square, the area of a square with side length s is given by the formula: A = s2 (square).

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How do you find the area of a circle with the diameter?

The formula for the area A as a function of the diameter d of a circle is given by A = π (d/2)^2.

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