Page 165 - Start Up Mathematics_3

3. Write the number and shape of faces and edges for each of the following figures.
Also, mention the number of vertices of each.

(a) (b) (c) (d)

4. The positions of the vertices of two shapes A B C D E F G H
are given below. Draw the shapes in the 1 • • • • • • • •
grid and name them.
2 • • • • • • • •
(a) (1, A), (1, D), (3, A), (3, D)
3 • • • • • • • •
(b) (3, F), (5, D), (5, H)
4 • • • • • • • •

5 • • • • • • • •
Patterns

Patterns are arrangement of repeated designs, figures, letters, objects or
numbers. You can see patterns on a dress, bedsheet, doors, walls, etc. and
even in series of numbers. For a design to be a pattern, it must follow

certain rules of sequence.

Example 2: Look at the following designs to see whether they form
patterns or not.

(a)

(b)

(c) 20, 25, 30, 35, 40, 45, 50

(d)

(e) 1, 7, 10, 12, 16, 19, 31, 33, 51, 60, 80

Solution: (a) The given design follows a rule which is a square followed by a
triangle followed by a circle. Hence, it is a pattern.

(b) Since all the flowers are identical and are arranged in a sequence
according to their colour, this design is a pattern.

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