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The altitude to the hypotenuse of a right triangle forms two triangles that are similar to each other and to the original triangle.
Corollaries 8-1-2 Geometric means
The length of the altitude to the hypotenuse of a right triangle is the geometric mean of the lengths of the two segments of the hypotenuse.
Corollary 8-1-3 Geometric means
the length of a leg of a right triangle is the geometric mean of the hypotenuse and the segment of the hypotenuse adjacent to that leg.
Theorem 8-5-1 The Law of Sines
For any ΔABC with side lengths a, b, and c, sin A / a = sin B / b = sin C / c.
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