std 3(Maths) SCERT [Lesson 4 when shapes Join]
Lesson 4
When Shapes Join
Activity 1[complete
the following]
1.Shapes that can be
drawn on flat
surfaces are called
-------figures
2. Number of sides
in a triangle is-----
3. The number of
triangles in the set
of figures
[Δ🔺⛛⭕▭▯⛛⊳◯]
is ------
Answer: [ 1) Plane
figures, 2) 3 sides,
3) 5]
Activity 2 [How
many triangles in
following figures]
i)
ii)
Activity 3 [Answer
the following
questions as
directed.
Use straight lines to
divide each of the
figures given below,
as directed. ]
Example
Use 3 Straight lines
and divide the
triangle into four
A) Use one straight
line and divide the
rectangle into two
triangle
b) Divide the
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