This last week Elsa and Nora did a great job with this video where they show how to make a finish star. I hope you will enjoy it!
Monday, 25 May 2015
1st ESO PROJECTS
The 1st ESO students work
in groups each week to present a project. They develop a creative and original
idea and they show to their mates how to do it.
This last week Elsa and Nora did a great job with this video where they show how to make a finish star. I hope you will enjoy it!
This last week Elsa and Nora did a great job with this video where they show how to make a finish star. I hope you will enjoy it!
Wednesday, 13 May 2015
Triangles
Definition
A triangle is a closed figure consisting of three line segments linked
end-to-end. A triangle
has three sides and three angles.
Triangle properties
Vertex
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The vertex (plural: vertices) is a corner of the triangle. Every triangle
has three vertices.
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Base
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The base of a triangle can be any one of the three sides, usually the one
drawn at the bottom.
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Perimeter
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The distance around the triangle. The sum of its sides.
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Interior angles
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The three angles on the inside of the triangle at each vertex.
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Exterior angles
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The angle between a side of a triangle and the extension of an adjacent
side.
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Altitude or height
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The altitude of a triangle is the perpendicular from one side to the
opposite vertex. The three altitudes intersect at a single point, called the orthocenter of the triangle.
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Median
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The median of a triangle is a line from a vertex to the midpoint of the
opposite side.Thethree medians intersect at a single point, called the centroid of the triangle.
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Circumcenter
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The circumcenter
(circuncentro) is the point of intersection of the three perpendicular
bisectors of the sides. The circumcenter is also the center of the
triangle's circumcircle (circunferencia circunscrita) - the circumference
that passes through all three of the triangle's vertex.
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Incenter
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The point of
intersection of the three angles bisector is the incenter (Incentro).
The incenter is also the center of the triangle's incircle (circunferencia
inscrita)- the largest circle that will fit inside the triangle.
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Also:
- The shortest side is always opposite the smallest interior angle
- The longest side is always opposite the largest interior angle
Properties of all triangles
- The interior angles of a triangle always add up to 180°
- The exterior angles of a triangle always add up to 360°
Terminology
It is usual to name each vertex of a triangle with a single capital
(upper-case) letter. The sides can be named with a single small (lower case)
letter, and named after the opposite angle.
Classification of triangles
From: http://www.mathopenref.com/triangle.html
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