A triangle is a polygon. It is a closed 3-sided shape made up of straight lines. The ‘tri-’ part of the word triangle means three. A triangle has 3 sides and 3 angles. Interior angles are the angles ...

"What exactly is an inscribed angle?" "I always forget the relationship with the central angle." "I sort of get it when I see a diagram, but I get stuck when it comes to problems." Many people feel ...

"What is the difference between similarity and congruence?" "If the shape is the same, they all look the same to me." "Terms like similarity ratio and corresponding sides make it feel suddenly ...

In the study of circular functions, the unit circle plays a central role in linking angles with trigonometric values. By defining sine, cosine, and tangent in terms of coordinates on a circle of ...

With binoculars you can see so much more in the night sky. Take our deep-sky tour and find out.

Some standard modules for making 3d shapes with attachment support, and function forms that produce a VNF. Also included are shortcuts cylinders in each orientation and extended versions of the ...

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