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TRIANGLES
AND
TYPES OF TRIANGLES
We get a TRIANGLE by joining
three non collinear points .
What is a TRIANGLE ?
• A closed figure formed by
joining three line segments is
called a TRIANGLE .
A triangle has three sides
A triangle has three
angles
TYPES OF TRIANGLES
Two Ways
• On the basis of angles
• On the basis of sides
On the basis of ANGLES
Three types
• Acute angled triangle
• Right angled triangle
• Obtuse angled triangle
Acute angled triangle
• A triangle whose all the angles
are acute is called an ACUTE
ANGLED TRIANGLE .
Right angled triangle
• A triangle in which one of the
angle is right angle is called
RIGHT ANGLED TRIANGLE.
Obtused angled triangle
• A triangle in which one of the
angle is obtuse angle is called
OBTUSED ANGLED TRIANGLE .
On the basis of sides
Three types
• Equilateral triangle
• Isosceles triangle
• Scalene triangle
Equilateral triangle
• A triangle whose all the sides
are of equal length is called
equilateral triangle.
Isosceles triangle
• A triangle whose any two sides
are of equal measure is called
scalene triangle.
Scalene triangle
• A triangle whose no two sides
are of equal measure is called
scalene triangle.
Recap
• A closed figure formed by joining
three non collinear points is called
• A triangle whose all the sides are of
equal length is called
• A triangle whose no two sides are of
equal length is called
• A triangle whose one angle is 90
degree is called
• A triangle whose all the angles are
less than 90 degree is called
4748514.ppt

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4748514.ppt

  • 2. We get a TRIANGLE by joining three non collinear points .
  • 3. What is a TRIANGLE ? • A closed figure formed by joining three line segments is called a TRIANGLE .
  • 4. A triangle has three sides
  • 5. A triangle has three angles
  • 6. TYPES OF TRIANGLES Two Ways • On the basis of angles • On the basis of sides
  • 7. On the basis of ANGLES Three types • Acute angled triangle • Right angled triangle • Obtuse angled triangle
  • 8. Acute angled triangle • A triangle whose all the angles are acute is called an ACUTE ANGLED TRIANGLE .
  • 9. Right angled triangle • A triangle in which one of the angle is right angle is called RIGHT ANGLED TRIANGLE.
  • 10. Obtused angled triangle • A triangle in which one of the angle is obtuse angle is called OBTUSED ANGLED TRIANGLE .
  • 11. On the basis of sides Three types • Equilateral triangle • Isosceles triangle • Scalene triangle
  • 12. Equilateral triangle • A triangle whose all the sides are of equal length is called equilateral triangle.
  • 13. Isosceles triangle • A triangle whose any two sides are of equal measure is called scalene triangle.
  • 14. Scalene triangle • A triangle whose no two sides are of equal measure is called scalene triangle.
  • 15. Recap • A closed figure formed by joining three non collinear points is called • A triangle whose all the sides are of equal length is called • A triangle whose no two sides are of equal length is called • A triangle whose one angle is 90 degree is called • A triangle whose all the angles are less than 90 degree is called