Triangles How many triangles can you count in this picture? Are they the same? What is it? A triangle is a closed figure with three sides. Parts of a triangle It has three sides and three angles The three angles always add to 180° HOW CAN WE CLASSIFY THEM? Triangles Can be classified according to their Sides Angles Equilateral Acute Isosceles Right Scalene Obtuse Acording to their sides: a) Equilateral triangle Three equal sides Three equal angles, always 60° b) Isosceles Triangle Two equal sides Two equal angles Acording to their sides: c)Scalene Triangle No equal sides No equal angles Acording to their angles: a) Acute Triangle All angles are less than 90° B) Right Triangle Has a right angle (90°) Acording to their sides: C) Obtuse Triangle Has an angle more than 90 Now….. Time to practice

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