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Since the unknown side of the triangle is the hypotenuse, and you know the opposite side, you should use the sine relationship to solve the problem:

So far, we know the how to calculate the acute angles that make up the fundamental right triangles of a polygon with N sides. Now, using that information, ...

Give your prism a 3D appearance by drawing two lines: one off the top corner and one off the base corner of the triangle, closer to the horizon point.

Given the angle of depression is \begin{align*}53^\circ\end{align*}, \begin{align*}\angle{A}\end{align*} in the figure above is ...

How are you going to paint — physically? Do you prefer an easel, where the canvas is upright or at a slight angle? Or do you work better with the canvas on ...

Here's my definitive buyers guide for the Best Drawing Tablets that are just perfect for graphic designers, digital artists & illustrators of all levels.

In this tutorial, we're going to take a quick look at the speed square, a tool that you may already have, but may not fully understand. While made for ...

The presets change the grid aspect ratio as shown above. There is also a 'custom' option which allows the user to define their own aspect ratio.

Learn how to paint this VERY easy, simple canvas painting of two love bird silhouettes on a branch. This step by step canvas painting tutorial will guide ...

A comparison of a Chinese and a Greek geometric theoremThe figure illustrates the equivalence of the

Because this is an essential skill for anyone working with paint, we put together an essential guide to stretching canvas that you try in your studio.

'Dazzle' camo has been used in real conflicts ever since the first world war with the intention being that high contrast shapes and angles break up the ...

Note: The sine, cosine, and tangent of an angle have no units. If the measurements of the triangles above were in meters, then the units would cancel out.

All you do now is draw lines from the back corners toward the opposite horizon VPs, and you've just completed a simple shape in three-point perspective.

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Set the Angle guide to 120 degrees and snap it to the corner, but just draw the portion of line that extends upward into the center of the triangle.

... triangle will be a bit rounded, or not quite the right angle. You know what's much easier? Painting over the excess of that rounded corner with a nice ...

Then move the Angle guide so its corner rests at the tip of the line you just drew, right in the center of the triangle. The 120 degrees will bisect the ...

Detail from Raphael's The School of Athens featuring a Greek mathematician – perhaps representing Euclid or Archimedes – using a compass to draw a geometric ...

Oil paint doesn't change much when dry, but acrylics will end up slightly darker than they look while you're painting. Take this into account from the ...