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-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 - 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. -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. - Scalene triangles have three sides of different length and three angles of different sides. - A right angle triangle has one of its angles equal to 90º (one its angles is a right angle). -An acute angle triangle has all angles smaller than 90º. - All three angles are acute. -An obtuse angle triangle has one angle greater than 90º. - That is, one angle is obtuse. The angles in all triangles equal 180º. For Example... http://www.helpingwithmath.com/by_subjec t/geometry/geo_worksheets.htm For each of the following: 1. Label the size of the missing angle 2. Classify as i) right angle ii) acute angle iii) obtuse angle triangle 3. Classify as i) Equilateral ii) Scalene iii) Isosceles triangle