Chhattisgarh board CHAPTER- 11 Geometrical Figures class 5 maths | cg board geometrical figures
0Chhattisgarh board CHAPTER- 11 Geometrical Figures class 5 maths | cg board geometrical figures
Know more about triangles
You know that an angle
consists of one vertex and two
arms or sides. In the same way a
triangle also has vertices, angles
and vertex sides.
A triangle as
the name suggests
has three vertices,
three angles and
three sides.
Identify these in triangles ABC and write them.
Triangle ABC can be written as triangle CAB, triangle BCA ...etc.
Now look at the triangles shown below and identify their vertices, sides and
angles and fill the given table.
Types of triangle -
Collect some twenty to thirty twigs or sticks of a broom with the help of you
friends. Now make different triangles using these.
Look at the triangles carefully
Are all the triangles the same?
• If not what is the difference between them? Talk with your friends.
• Have you got some triangles, which have two sides of equal length?
• Have you got some triangles, which have three sides of equal length?
• If you do not have any such triangle in which two sides are of equal
measure or all three sides of equal measure, then make such triangles.
Now you have the following three types of triangles.
One which has all three sides of different length.
One which has two sides of equal length, and
One which has all three sides of equal length.
Can these triangles have different names?
The names, decided according to the length of sides are:
Triangles which have all sides of equal length are called equilateral triangle.
Triangle with two sides of equal length are called isosceles triangles.
Triangles with all three sides of different and unequal length are called scalene
triangles. “Are the triangles named, on the basis of angles?”
From the angles given below identify the acute angles, right angles and obtuse
angles. Write the types you identify in each of the triangle in the table given below.
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