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Triangles

Triangles. The word triangle means three angles. Every triangle has three angles and three sides. Triangles can be classified according to the length of their sides or the size of their angles. The sum of all angles in a triangle equals 180 º. Classifying Triangles According to the Length

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Triangles

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  1. Triangles

  2. The word triangle means three angles. • Every triangle has three angles and three sides. • Triangles can be classified according to the length of their sides or the size of their angles. • The sum of all angles in a triangle equals 180º

  3. Classifying Triangles According to the Length Of their Sides

  4. Equilateral Triangles • - An equilateral triangle has the same length on all three sides. • Identical marks on all sides of the triangles indicates that the triangle’s side has the same lengths. • The angles of a equilateral triangle are all the same.

  5. Isosceles Triangles • Isosceles triangles have two sides of the same length and two angles of the same size. • The side that is not the same length is the base.

  6. Scalene Triangle - Scalene triangles have three sides of different length and three angles of different sides.

  7. Right Angle Triangle - A right angle triangle has one of its angles equal to 90º (one its angles is a right angle).

  8. Acute Angle Triangle • An acute angle triangle has all angles smaller than 90º. • All three angles are acute.

  9. Obtuse Angle Triangle • An obtuse angle triangle has one angle greater than 90º. • That is, one angle is obtuse.

  10. Finding the Angle in Triangles The angles in all triangles equal 180º. For Example...

  11. http://www.helpingwithmath.com/by_subject/geometry/geo_worksheets.htmhttp://www.helpingwithmath.com/by_subject/geometry/geo_worksheets.htm

  12. Complete the following… For each of the following: Label the size of the missing angle Classify as i) right angle ii) acute angle iii) obtuse angle triangle Classify as i) Equilateral ii) Scalene iii) Isosceles triangle

  13. 1. 2. 3. 4.

  14. 5. 6.

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