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03 May

SECONDES EURO - TRIANGLES

Publié par Sandrine CHARAVY  - Catégories :  #SECONDES EURO

TRIANGLES


DEFINITION OF A TRIANGLE: it is a three-sided polygon that can be classified by angles, as in an acute triangle, or by sides, as in an equilateral triangle.

  • sum of interior angles =180°
  • area : (basis*height)/2

1.       TRIANGLE TYPES CLASSIFIED BY ANGLES.

RIGHT –ANGLED TRIANGLE OR RIGHT TRIANGLE (US): it is a triangle with one of its angle exactly equal to 90°.

 

http://www.glue-it.com/model-engineering/general-information/glossary/t/pictures/triangle02.gif

 

OBTUSE TRIANGLE: it is a triangle with one of its angle greater than (>) 90°.

http://www.lexington.k12.il.us/teachers/menata/MATH/geometry/triangle-obtuse.gif

 

 

ACUTE TRIANGLE: it is a triangle with all three angles less than (<) 90°.

http://www.lexington.k12.il.us/teachers/menata/MATH/geometry/triangle-acute.gif

   

2.       TRIANGLE TYPES CLASSIFIED BY SIDES

EQUILATERAL TRIANGLE: it is a triangle that has equal length on all three sides. All equilateral triangles are equiangular triangles.

 

 

http://upload.wikimedia.org/wikipedia/commons/thumb/f/fc/Equilateral_Triangle.svg/600px-Equilateral_Triangle.svg.png

 

 

 ISOSCELES TRIANGLE: it is a triangle with two equal length sides.  It has also has two equal angles (two congruent angles and sides).

http://spartans.sstx.org/~krutkowski/notes%20and%20resources/chapt4refweb/chapt4ref9.gif

 

SCALENE TRIANGLE: It is a triangle with all no equal side and no equal angles too.

http://www.printable-math-worksheets.com/images/Scalene_Triangle.gif

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Ce blog pédagogique est adressé aux élèves du lycée Jacob Holtzer mais également aux parents qui souhaitent découvrir les différentes activités menées en classe et les projets proposés aux élèves de la cité scolaire.