Welcome to The Riddler. Every week, I offer up problems related to the things we hold dear around here: math, logic and probability. There are two types: Riddler Express for those of you who want ...

This equation will be helpful for us to know when drawing a circle onto the console. We need to isolate and find the "r" variable, so we take the sqrt( (x-h)^2 + (y-k)^2 ). The reason why this is ...

This Java program allows users to draw basic shapes such as triangles, rectangles, and circles using a graphical interface. The program prompts the user to choose a shape and input its dimensions, and ...

An impossible triangle, also known as a Penrose triangle or an Escherian triangle, is an optical illusion that appears to violate the rules of geometry due to its mind-bending configuration. It was ...

Optical Illusion: An optical illusion is an image that tricks your eyes so that what you think you see is different from what is really there. Or we can say that an optical illusion is a visual ...

STEP 1: Using a pencil and ruler, draw a horizontal line. Set the compass to the width of the line. Place the compass at either end of the line and draw two arcs that cross in the middle. Image ...

Royalty-free licenses let you pay once to use copyrighted images and video clips in personal and commercial projects on an ongoing basis without requiring additional payments each time you use that ...

This cute concept traffic light, called the UNISignal, aims to avoid the dangers caused by colorblind drivers or foreigners who don't know the local ways of the road. It does this by changing the ...