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    Basic Concepts in GeometryTriangle

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    Triangle

    Equilateral Triangle

    All sides equal

    All angles equal

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    Triangle

    Isosceles Triangle

    Two sides equal

    Two angles equal

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    Triangle

    Scalene Triangle

    No sides equal

    No angles equal

    All different

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    Acute TriangleAll angles are less than

    90

    Right TriangleHas a right angle (90)

    Obtuse TriangleHas an angle more than

    90

    Triangle

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    Triangle

    Right IsoscelesTriangle

    Has a right angle (90),

    and also two equal

    angles

    Quick Question

    What are these two equal

    angles?

    45 degrees each.

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    Triangle

    What is Pythagorean theorem?

    This is one of the most famous

    things about triangles.

    Quick

    Question

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    Triangle

    b base

    h Height

    Area of triangle: 2

    hb

    Perimeter of Triangle: Sum of

    lengths of all sides.

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    TriangleFind the area.

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    Similar Triangles1. all their angles equal

    2. corresponding sides have the same ratio

    Play with similar

    triangles

    http://www.mathopenref.com/similartriangles.htmlhttp://www.mathopenref.com/similartriangles.htmlhttp://www.mathopenref.com/similartriangles.html

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    Similar TrianglesFor all similar triangles, sides facing equal angles are always in

    the same ratio.

    In triangle S: a = 5.6, b = 4.8

    5.6

    4.8

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    Similar Triangles

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    Similar Triangles

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    Similar Triangles

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