Today our topic of discussion is Ratio, Similarity and Symmetry Exercises 14.3.
Ratio, Similarity and Symmetry Exercises 14.3
Exercise 14.3
1. In plane geometry:
(i) The triangle is a polygon made up of the least number of line segments. (ii) A rhombus is the regular polygon of four sides
(iii) Sides of a regular polygon are equal, but angles are not
Which of the following is true?
1) i
2) i and ii
3) i and iii
4) i, ii and iii
2. How many lines of symmetry does a scalene triangle have?
1) 0
2) 1
3) 3
4) Countless
From the following figure, answer question 3 and 4.
The length of each side of the polygon is 6 c.m.
3. How many lines of symmetry does the polygon have?
1) 3
2) 6
3) 7
4) Countless
4. For the polygon-
(i) Order of rotational symmetry is 4 (ii) The angle of rotation is 60°
(iii) Each angles in equal
Which of the following is true?
1) i
2) ii
3) ii and iii
4) i, ii and iii
5. Which one of the followings has line of symmetry?
1) Figure of a house
2) Figure of a mosque
3) Figure of a temple
4) Figure of a church
5) Figure of a pagoda
6) Figure of a parliament.
7) Figure of a mask
8) Figure of the building of the Tajmahal.
6. Lines of symmetry are given (dashed lines), complete the geometrical figures and identify:
7. Find the lines of symmetry of the following figures:
8. Complete the following figures such that reflection symmetry is achieved:
9. Find the rotational symmetry of the following figure:
10. Draw those English letters that have symmetry with respect
1) Horizontal mirror
2) Vertical mirror
3) Both horizontal and vertical mirrors
11. Draw three figures which do not have symmetry.
12. When you slice a lemon, the cross-section looks as shown in the figure. Determine the rotational symmetry of the figure.
13. Fill in the blanks:
14. Name the quadrilaterals which have line of symmetry and rotational symmetry of order more than 1.
15. Can we have a rotational symmetry of a body of order more than 1 whose angle of rotation is 18°? Justify your answer.
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