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The tangent of the angle = the length of the opposite side. the length of the adjacent side.

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The cosine of the angle = the length of the adjacent side. the length of the hypotenuse.

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The sine of the angle = the length of the opposite side. the length of the hypotenuse.

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If the measures of the corresponding sides of two triangles are proportional then the triangles are similar. You use this to find x.

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The Pythagorean theorem deals with the lengths of the sides of a right triangle. The theorem states that: The sum of the squares of the lengths of the legs of a right triangle ('a' and 'b' in the triangle shown below) is equal to the square of the length of the hypotenuse

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If you need to find a line that bisects a given line segment. This middle point is called the midpoint.

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RATIO
- the quantitative relation between two amounts showing the number of times one value contains or is contained within the other.

PYTHAGOREAN THEOREM - a theorem in geometry: the square of the length of the hypotenuse of a right triangle equals the sum of the squares of the lengths of the other two sides.

PROPORTIONS
- a part, share, or number considered in comparative relation to a whole.

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Similar Triangles - MathHelp.com - Geometry Help