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Practice Time 9E

1. Which of the following shapes of tiles do not make a regular tessellation?
(a) Squares (b) Rectangles (c) Equilateral triangles (d) Regular hexagons

2. Two different pentagons can be used to make:

(a) A regular tessellation
(b) A semi-regular tessellation

(c) A tessellation that is neither regular nor semi-regular
(d) No tessellation at all

3. In the given figure, a tessellation that is neither regular nor semi-regular is made. What are the two
shapes you observe here?

4. Can a regular hexagon and a rhombus be used to make a regular tessellation pattern?

5. Name the shapes used in this semi-regular tessellation. Also extend the pattern.

6. Which regular polygons cannot be used to make a regular tessellation?
7. Which one of the following combinations cannot be used to make a semi-regular tessellation?

(a) Equilateral triangles and squares
(b) Equilateral triangles and hexagons

(c) Equilateral triangles and octagons
(d) Equilateral triangles and dodecagons (regular 12-sided polygons)

maths fun
To participate in a Rangoli competition, Sumedha was looking for a design.
She found a design that was based on one-quarter of the pattern. So she
chose similar colours to complete the pattern.
Now she wants to use colours in such a way that it would end up with
a design that has
(i) exactly one line of symmetry
(ii) exactly two lines of symmetry
Help her to find the number of lines of symmetry also.

271 Symmetry