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4.1 - Copy - 4-1 Angles and Triangles(The Basic Terms A The...

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4-1 Angles and Triangles (The Basic Terms) A) The basic terms a. Angle i. The union of two noncollinear rays having a common endpoint 1. 2. Sides- the two rays of an angle 3. vertex- the common end point of the rays ii. When can we use the vertex to name an angle? 1.
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iii. Is the following an angle 1. ( it determines an angle but that doesn’t mean that it is one) b. Interior and exterior i. The interior of BAC is the set of all points P in the plane of BAC such that 1. P and B are on the same side of AC 2. P and C are on the same side of AB ii. The exterior of BAC is the set of all points of the plane of BAC that lie neither on the angle nor in its interior.
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c. Triangle i. If A, B and C are any three noncollinear points, then the union of the segments
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