Geometry | Term 3 Chapter 1 | 3rd Maths - Diagonal | 3rd Maths : Term 3 Unit 1 : Geometry
Chapter: 3rd Maths : Term 3 Unit 1 : Geometry
Diagonal
Diagonal
Diagonal is the line
joining opposite corners of a geometrical shape.
Observe the corners of the square.
The line joining opposite corners of a square is called the diagonal of the square.
A square has two diagonals.
Diagonals of a cube:
A Cube has six square faces. Each
square has two diagonals.
Diagonals in the faces = 6 × 2 = 12.
Diagonals in the inner sides of 4
corners = 4.
Total number of diagonals of a cube =
12 + 4 = 16.
Draw the diagonals for
the given rectangle.
How many diagonals will be there in a
cuboid? 16
.
Match the properties of
2D shapes by observing their sides and corners (vertices).
1. Opposite sides are equal. (d)
2. There are no sides and corners. (a)
3. Sides may or may not be equal. (b)
4. All the four sides are equal. (c)
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