A triangle is a polygon formed by joining three non-collinear points. Triangles can be classified based on their side lengths or angles. There are three types of triangles based on sides: equilateral (all sides equal), isosceles (two sides equal), and scalene (all sides unequal). Based on angles, triangles are right (one 90 degree angle), acute (all angles less than 90 degrees), or obtuse (one angle greater than 90 degrees). A triangle is thus defined as a three-sided polygon where the sum of the interior angles is 180 degrees.

1. TRIANGLES
AND
TYPES OF TRIANGLES
Made by - Atharva Dwivedi

2. We get a TRIANGLE by joining three non
collinear points .
A triangle definition states it is a
polygon that consists of three
sides, three edges, three
vertices and the sum of internal
angles of a triangle equal to
180.

3. TYPES OF TRIANGLES
Two Ways
On the basis of angles
On the basis of sides

4. On the basis of sides
Three types of triangles

5. Equilateral triangle
A triangle whose all the sides are of equal length is called
equilateral triangle.

6. Isosceles triangle
A triangle whose any two sides are
of equal measure is called
ISOSCELES TRIANGLE .

7. Scalene triangle
A SCALENE TRIANGLE is a triangle that has no
equal sides.

8. On the basis of ANGLES

9. Acute angled triangle
A triangle whose all the angles are acute is called an
ACUTE ANGLED TRIANGLE .

10. Right angled triangle
A triangle in which one of the angle is right angle is called
RIGHT ANGLED TRIANGLE.

11. Obtused angled triangle
A triangle in which one of the angle is obtuse angle is
called OBTUSED ANGLED TRIANGLE .

12. Recap
• A closed figure formed by joining three non collinear points is
called TRIANGLE .
• A triangle whose all the sides are of equal length is called
EQUILATERAL TRIANGLE.
• A triangle whose all the sides are of unequal length is called
SCALENR TRIANGLE .
• A triangle whose one angle is 90 degree is called RIGHT
ANGLED TRIANGLE .
• A triangle whose all the angles are less than 90 degree is
called ACUTE ANGLED TRIANGLE .
• A triangle in which one of the angle is obtuse angle is called
OBTUSED ANGLED TRIANGLE .

13. NAME – ATHARVA DWIVEDI
CLASS – 7th B
SETH M.R. JAIPURIA SCHOOL
ORAI
THANK YOU