©2010 G Dear – Not to be sold/Free to use Stage 4 Years 7 & 8 Triangles Types of Triangles Press Ctrl-A ©2010 G Dear – Not to be sold/Free to use

Triangle Classification (1/6) Triangles are classified based on their … Angles or Sides Click Here Acute-angled Equilateral Three acute Angles Three equal sides. Right-Angled Isosceles One right angle. Two equal sides Obtuse angled Scalene One obtuse angle. No equal sides. End of Slide

Triangle Classification (2/6) Use an Angle and Side Name for each triangle. Angle Side Acute angled Equilateral End of Slide

Triangle Classification (3/6) Use an Angle and Side Name for each triangle. Angle Side Right angled Scalene End of Slide

Triangle Classification (4/6) Use an Angle and Side Name for each triangle. Angle Side Obtuse angled Scalene End of Slide

Triangle Classification (5/6) Use an Angle and Side Name for each triangle. θo Angle Side Acute Angled Isosceles End of Slide

Triangle Classification (6/6) Use an Angle and Side Name for each triangle. Angle Side αo βo γo Obtuse Angled Scalene End of Slide

Angle Classification (1a/6) Acute Angled Triangle All angles are acute. That is < 90o. End of Slide

Angle Classification (1b/6) Right Angled Triangle One angle is a right-angle. That is = 90o. End of Slide

Angle Classification (1c/6) Obtuse Angled Triangle One angle is an obtuse-angle. That is > 90o. End of Slide

Side Classification (1d/6) Equilateral Triangle 60o 60o 60o Three equal length sides. Three equal 60o angles. End of Slide

Side Classification (1e/6) Isosceles Triangle θo θo Two equal length sides. Two equal angles. End of Slide

Side Classification (1f/6) Scalene Triangle βo γo αo No equal length sides. No equal angles. End of Slide