Constructing a tangent line using compass and straightedge | Geometry | Khan Academy

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Geometry on Khan Academy: We are surrounded by space. And that space contains lots of things. And these things have shapes. In geometry we are concerned with the nature of these shapes, how we define them, and what they teach us about the world at large--from math to architecture to biology to astronomy (and everything in between). Learning geometry is about more than just taking your medicine ("It's good for you!"), it's at the core of everything that exists--including you. Having said all that, some of the specific topics we'll cover include angles, intersecting lines, right triangles, perimeter, area, volume, circles, triangles, quadrilaterals, analytic geometry, and geometric constructions. Wow. That's a lot. To summarize: it's difficult to imagine any area of math that is more widely used than geometry.

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[cinnamonroarz]

Thanks! Khan academy leveled my math level from 3rd to 10th in just a year!

[jasonflynn]

There is a challenge to construct the tangent going through point p, but by only using the compass twice and one line segment(the segment will be the tangent line). Any ideas?

[theskoomacat]

What is this program/website? It seems very interesting