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ICSE / ISC eBooks

Exercise – 15

Q. 1. Draw an equilateral triangle each sides equal to 5 cm. Draw all its lines of symmetry.

Q. 2. Draw a rectangle of sides 6 cm and 4 cm. Draw all its lines of symmetry.

Q. 3. Draw a square of sides 5 cm and draw all its lines of symmetry.

Q. 4. Draw a triangle ABC, where AB = AC = 5 cm, BC = 6 cm. Draw all its lines of symmetry.

Q. 5. Draw a rhombus of sides 4 cm and one angle 60⁰. Draw all its lines of symmetry.

Q. 6. Draw a hexagon of sides 4 cm. Draw all its lines of symmetry.

Q. 7. Part of a geometrical figure is given in each of the diagrams. Complete the figure in such a way that both the x-axis and the y-axis becomes lines of symmetry of the completed figures.

Q. 8. A polygon in drawn with one vertex at the point (5, -3). What must be the co-ordinate of one other vertex if the polygon has

1. Point symmetry about the origin
2. Line symmetry about the x-axis
3. Line symmetry about the y-axis
4. Line symmetry about the line x = 1
5. Line symmetry about the line x + 1 = 0

Q. 9. Part of geometrical figure is given in each of the diagram below. Complete the figures so that the line AB in each case is a line of symmetry of the completed figure.

Q. 10. Part of geometrical figure is given in each of the diagram below. Complete the figure, so that the line ‘l’ in each case, is the line of symmetry of the completed figure.

Answers

Ans. 1.

Ans. 2.

Ans. 3.

Ans. 4.

Ans. 5.

Ans. 6.

 

Ans. 7. (i)

(ii)

(iii)

(iv)

Ans. 8.

1. (-5, 3)
2. (5, 3)
3. (-5, -3)
4. (-3, -3)
5. (-7, -3)

 

Ans. 9. (i)

(ii)

(iii)

(iv)

Ans. 10. (i)

(ii)

(iii)

(iv)