basic concepts of geometry - triangle 2
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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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