# Author: Sergiu Funieru

## What is a right triangle?

A right triangle is a triangle that has a right angle.

Continue reading## How to convert an image to black and white (using IrfanView)

How to convert an image to black and white (using IrfanView) To convert, using IrfanView, an image to black and

Continue reading## Pitagora’s theorem (formula and picture)

In every right triangle, the square of the hypotenuse equals the sum of the squares of the legs.

Continue reading## How to find, in PHP, the length of a string

To find, in PHP, the length of a string, you can use the function strlen: https://www.php.net/manual/en/function.strlen.php

Continue reading## Calculate the modulus of a complex number (problem with solution) – article 1822

Formula used: The formula for the modulus (absolute value) of a complex number – article 1790. Join the LUNLUN.com’s free

Continue reading## Calculate the modulus of a complex number (problem with solution) – article 1818

Formula used: The formula for the modulus (absolute value) of a complex number – article 1790. Join the LUNLUN.com’s free

Continue reading## Calculate the modulus of a complex number (problem with solution) – article 1816

Formula used: The formula for the modulus (absolute value) of a complex number – article 1790. Join the LUNLUN.com’s free

Continue reading## Calculate the modulus of a complex number (problem with solution) – article 1814

## Calculate the modulus of a complex number (problem with solution) – article 1812

For the formula of the modulus of a complex number, please see The formula for the modulus (absolute value) of

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