Page 167 - Start Up Mathematics_3

3. Observe the patterns in numbers and write the next 3 numbers.

(a) 8, 12, 16, 20, ______, ______, ______

(b) 3, 8, 13, 18, 23, ______, ______, ______

(c) 10, 25, 30, 45, 50, ______, ______, ______

(d) 50, 100, 150, 200, ______, ______, ______

(e) 480, 460, 440, 420, ______, ______, ______

(f) 99, 88, 77, 66, ______, ______, ______

Symmetry

Look at the picture of the butterfly given alongside carefully.

Notice that the left side of the butterfly is similar to its right side.
So, we can divide the picture of butterfly into two similar halves by
drawing a line through the centre as shown.

Similarly, there are many other natural and man-made things which
show similarity in their halves. Let’s see some of them.

Remember
Anything which can be divided into similar parts is
called symmetrical and the line which divides it into A figure can have more than
similar parts is called line of symmetry. This property one line of symmetry.
of being made of exactly similar parts is known as
symmetry.

Tilings

You must have seen tiles on the walls and floors of
kitchen, bathrooms and even rooms. We use tiles to cover a surface. They can be of
any shape, size, design and colour. Arranging tiles in a pattern such that they fit next
to each other without leaving any gaps in between is known as tiling.

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