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 ... Read More

A number is said to be an ugly number, if the prime factors of that input number only include 2, 3 and 5. Maybe some number has some prime factors which have only one factor or two factors but those factors must be one of 2, 3, and 5. In ... Read More

A number is said to be a Strong 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 the factorial of every digit of the given number. After that we have to calculate the ... 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 ... 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 ... Read More

A number is said to be a Goldbach number, if the number can be expressed as the addition of two odd prime number pairs. 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 ... Read More

A rectangle is a closed two-dimensional shape which has 4 sides and 4 corners. The opposite sides are of the same length and parallel to each other. All the 4 interior angles are equal, angles measure 90 degrees each. It is a four-sided polygon. We will see 2 approaches in ... 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 ... Read More

An octahedron is a three-dimensional shape which has eight plane faces. Simply, it is a polyhedron with eight faces, twelve edges and 6 vertices. It is derived from a Greek word i.e. ‘Oktaedron’ which means Eight Faced. Formula to find volume of octahedron − $$\mathrm{Volume\: =\: \sqrt{2}/3\: × \:a^3}$$ Where, ... Read More

A dodecahedron is a three-dimensional shape which has twelve flat faces. It is derived from two Greek words i.e. ‘dodeka’ which means 12 and ‘hedra’ which means face. Simply, it is a polyhedron with twelve sides or faces. It is also called dodecahedron. Formula to find volume of dodecahedron ... Read More