Java Articles - Page 74 of 440

What is Empire Number? A number is said to be an Empire number if it is a prime number, and when we reverse that number, we should get another prime number. For example, let's consider the number 17. We know that 17 is a prime number, and if we reverse this number, we get 71, which is also a prime number. Therefore, 17 is known as an empire number. Here are some other examples of prime numbers such as 11, 13, 17, etc. Input & Output Scenarios Below are a few input and output scenarios that help to understand the ... Read More

An arc of a circle is a segment or portion of the circumference of a circle. In other words, a curve between a pair of distinct points. The length of the arc refers to the length between two points along the arc (two points along a section of a circle or curve). It is a percentage of the circumference of the circle. When two lines intersect each other, the common meeting point is called a vertex and the geometrical figure between the two arms/lines is called an angle. Following diagram will help you to understand the arc and its length: ... Read More

Hypotenuse refers to the longest side, which is opposite to the right angle of a right-angled triangle. Following is the diagram of the Hypotenuse: Length of the Hypotenuse The length of the hypotenuse can be calculated using the Pythagorean theorem. According to it, the sum of the squares of the lengths of two sides is equal to the square of the length of the third side as follows: a2 + b2 = c2 c = √(a2 + b2) Where a, b, and c refer to the three sides of the right-angled triangle. You can write the above formula ... Read More

A hemisphere refers to the exact half of a sphere. Means if we divide a sphere in two equal parts then we will get two hemispheres. Hemisphere is a three-dimensional geometrical shape which has one flat face. There are many practical examples of hemispheres. The earth divided into 2 equal parts results 2 hemispheres i.e. Northern hemisphere and Southern hemisphere. The area occupied by the outer surface of a three-dimensional object is called the surface area. Formula to calculate surface area of hemisphere − Mathematically it can be represented as $$\mathrm{Surface \:Area \:= \:2\pi\:r^2}$$ Mathematically it can be represented as ... Read More

A number is said to be a Spy number, if the sum of the digits of the given number is equal to the product of the digits of the given number. For more clarification, we have to first calculate the sum of the digits of the given number. After that we have to calculate the product of the digits of the given number. Then we have to compare both the sum value and product value, if they are the same then the given number is a spy number otherwise it is not a spy number. In this article, we will ... Read More

A number is said to be a Special number, if the sum of factorials of the input number’s every digit is equal to the same input number. For more clarification, we have to find all the factors of every digit of the given number. After that we have to calculate the sum of those factorials. Then we have to compare both the sum value and input number, if they are the same then the given number is a special number otherwise it is not a special number. In this article, we will see how to check if a number is ... Read More

What is Goldbach Number? A number is said to be a Goldbach number if the number can be expressed as the addition of two odd prime number pairs. For example, let's consider the number 98 and find the pairs of prime numbers (19, 79). If you calculate the sum of 19 + 79, you get 98, so 98 is a Goldbach number. If we follow the above condition, then we can find that every even number larger than 4 is a Goldbach number because it must have any pair of odd prime number pairs. But the odd numbers are not satisfying because we know ... Read More

A Rectangle is a closed two-dimensional shape that has 4 sides and 4 corners. The opposite sides are of the same length and parallel to each other. All 4 interior angles are equal, angles measure 90 degrees. It is a four-sided polygon. Following is the diagram of the Rectangle: Checking Points Inside Rectangle A point is said to lie inside a rectangle if its x and y coordinates are between the x and y coordinates of the opposite corners of the rectangle. To determine whether the point lies within the rectangle, we will use the following approaches: ... Read More

An enneagon refers to a polygon with 9 sides with 9 internal angles. Where all the sides of the polygon are equal it is called a regular enneagon which has an internal angle of 140 degrees, and the sum of all internal angles are 1260 degrees. An enneagon is also referred to as Nonagon. Area of enneagon can be calculated by using When Length of Side (s) is given Area = 6.1818 * (s * s) When circumradius (r) is given Area = 2.8925 * (r * r) When apothem (a) is given Area = 3.2757 * (a ... Read More

An octahedron is a three-dimensional (3D) shape which has eight plane faces. In other words, a polyhedron is called an octahedron which has eight faces, twelve edges, and 6 vertices. A polygonal is a three-dimensional figure with flat polygonal faces, straight edges, and sharp corners or vertices. The word octahedron is derived from the Greek word that is Oktaedron, which means Eight faces. Here is the diagram of the octahedron, which has side a: Volume of octahedron The volume of an octahedron is the amount of space occupied by the octahedron. To calculate the volume of an octahedron, we ... Read More