12.1: Similar Triangles — Read

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12.1.1: Proportions
In our discussion of similar triangles the idea of a proportion will play an important role. In this section we will review the important properties of proportions.
12.1.2: Similar Triangles
Two triangles are said to be similar if they have equal sets of angles.
12.1.3: Transversals to Three Parallel Lines
Previously, we defined a transversal to be a line which intersects two other lines, We will now extend the definition to a line which intersects three other lines.
12.1.4: Pythagorean Theorem
In a right triangle, the square of the hypotenuse is equal to the sum of the squares of the legs.
12.1.5: Special Right Triangles
There are two kinds of right triangle which deserve special attention: the 30°−60°−90° right triangle and the 45°−45°−90° right triangle.
12.1.6: Distance from a Point to a Line

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