This document discusses the different types of triangles. It defines a triangle as a three-sided polygon with three angles. The angles of every triangle add up to 180 degrees. It then describes the characteristics of acute, obtuse, right, scalene, isosceles, and equilateral triangles.

2. THE WORLD OF TRIANGLES

3. Triangles
A triangle is a 3
sided polygon.
Every triangle has
three sides and
three angles.
When added
together, the three
angles equal 180°
C
ab
A Bc

4. Acute Triangles
• An Acute triangle
in which all three
angles are less
than 90°

5. Obtuse Triangles
• An obtuse triangle is a
triangle in which one
of the angles is
greater than 90°

6. Right Triangles
• A right triangle is
a triangle with an
angle of 90°

7. Scalene Triangles
• A scalene triangle
is a triangle with
three unequal
sides.

8. Isosceles Triangles
• An isosceles
triangle is a
triangle with two
equal sides.
h
b b
a

9. Equilateral Triangles
• An equilateral
triangle with all
three sides of
equal length.
aa
60° 60°
60°
a

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