Page 209 - ICSE Math 7

(e) Rotating a figure through 60° clockwise is equivalent to an anticlockwise rotation of _________.

(i) 60° (ii) 120° (iii) 300° (iv) 360°
(f) Number of lines of symmetry of a hexagon is:

(i) 4 (ii) 5 (iii) 6 (iv) 0
(g) A possible angle of rotation of a figure having rotational symmetry of order greater than 1
is _________.
(i) 26° (ii) 72° (iii) 200° (iv) 360°

2. Write True or False.
(a) The angle of rotation of a figure is obtained by dividing 360° by order of rotational symmetry.

(b) A figure not having rotational symmetry can have 3 lines of symmetry.
(c) If a figure is folded in two equal parts such that the two folds overlap each other exactly,
then the figure is symmetrical and the crease so formed is the line of symmetry.
(d) A capital letter and its corresponding small letter have equal number of lines of symmetry.

(e) If a figure possesses rotational symmetry, then it should look exactly the same at least once
upto a rotation of 180°.
3. Fill in the blanks.

(a) While opening the cap of a bottle, the direction of rotation is _____________.
(b) ____________ is moving a figure parallel to itself along a line.
(c) If after a rotation of 45° about a point the figure looks exactly the same, then the order of
rotation is ________________.

(d) Number of lines of symmetry of an isosceles right-angled triangle is _________.
(e) Angle of rotation of a figure which fits on to itself 3 times in a complete revolution is _______.

4. For the following, write whether the axis of symmetry is vertical or horizontal.

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

PRACTICE TIME

1. Draw the line(s) of symmetry for the following figures.

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

2. Complete the following figures so that the dotted line becomes the line of symmetry.

(a) (b) (c)

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