# Geo Ch. 9 McDougel Littel

### 13 terms by l_davis

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### Pythagorean Triple

A set of three positive integers a, b, and c that satisfy the equation c2=a2+b2

### Special Right Triangles

Right triabgles whose angle measures are 45, -45, -90, or 30, -60, -90

### Trigonometric Ratio

A ratio of the lengths of two sides of a right triangle

### Sine

A trigonometric ratio, abbreviated as sin.

### Cosine

A trigonometric ratio, abbreviated as cos.

### Tangent

A trigonometric ratio, abbreviated as tan.

### Angle of Elevation

When you stand and look up at a point in the distance, the angle that your line of sight makes with a line drawn horizontally

### Solve a Right Triangle

Determine the measurements of all sides and angles of a right triangle

### Magnitude of a Vector

The distance from the initial point to the terminal point of a vector

### Direction of a Vector

Determined by the angle that the vector makes with a horizontal line

### Equal Vectors

Two vectors that have the same magnitude and direction

### Parallel Vectors

Two vectors that have the same or opposite directions

### Sum of Two Vectors

The sum of u=<a1,b1> and v=<a2,b2> is u+v=<a1+a2, b1+b2>

Example: