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This is a sample lesson material for Advanced Organiser model.
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Types of Triangles
There are various types of triangles based on sides and angles.
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Based on SidesBased on Sides Based on AnglesBased on Angles
EquilateralIsoscelesScalene
Acute angle triangleRight angle triangleObtuse angle
triangle
Types of Triangles3
Madhavi_Dharankar_Advanced_Organiser_Model
Types of Triangles based on Sides
Equilateral Three
sides same
Three angles same (60)
Isosceles Two sides
same
Two angles same
• Scalene– All the
three sides different
– All the three angles different
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Madhavi_Dharankar_Advanced_Organiser_Model
Types of Triangles based on Angles
Acute Three
angles acute
All acute angles same or two acute angles same or all three angles different
Right One angle
right and two angles acute
Two acute angles same or two acute angles different
• Obtuse– One
angle obtuse and two angles acute
– Both acute angles same or both acute angles different
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Madhavi_Dharankar_Advanced_Organiser_Model
Types of Triangles based on Sides - Connection
Equilateral Three
sides same
Three angles same (60)
Acute angle triangles
Isosceles Two sides
same
Two angles same
Acute or right or obtuse angle triangles
• Scalene– All the
three sides different
– All the three angles different
– Acute or right or obtuse angle triangles
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Madhavi_Dharankar_Advanced_Organiser_Model
Types of Triangles based on Angles - Connection
Acute Three
angles acute
All acute angles same or two acute angles same or all three angles different
Equilateral or isosceles or scalene triangles
Right One angle
right and two angles acute
Two acute angles same or two acute angles different
Isosceles or scalene triangles
• Obtuse– One
angle obtuse and two angles acute
– Both acute angles same or both acute angles different
– Isosceles or scalene triangles
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A Few More Questions
How could we name these triangles differently?
Can we challenge our beginning statement “There are various types of triangles based on sides and angles”?
What could be some other ways of classifying the triangles?
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