Page 252 - Ganit Kaushal

Ex 8. After each of the following cuts, predict the shape of the hole when the paper is opened. After you
have made your prediction, make the cutouts and verify your answer. (NCERT)

(a) (b)

Sol. The complete figure will be as shown below:

(a) (b)

Ex 9. Find the number of lines of symmetry for the Sol. A total of 6 lines of symmetry are shown in
‘kolam’ below. Draw all of them. (NCERT) the figure below. They are shown by red dotted
lines for easy recognition.
l 2

3

4

5

Ex 10. Fill in the blanks to make the statement true: 6
(a) The number of lines of symmetry in a picture of the Taj Mahal is ________.
(b) The number of lines of symmetry in a rectangle and a square is________ (equal/unequal).
(c) If a line segment of length 5 cm is reflected in a line of symmetry (mirror), then its reflection (image)
is a ________ of length ________.
(d) The number of lines of symmetry in the regular pentagon is ________.

(e) The digits having exactly two lines of symmetry are ________ and ________.
(f) The number of digits having no lines of symmetry is ________.
(g) The number of capital letters of the English alphabet having only a horizontal line of symmetry is
________, having only a vertical line of symmetry is ________, having both horizontal and vertical
lines of symmetry is ________.
(h) A rhombus is symmetrical about ________.
(i) The digit(s) having exactly one line of symmetry is/are ________.
(j) The number of capital letters of the English alphabet having no line of symmetry is ________.
Sol. (a) one (b) unequal (c) line segment; 5 cm
(d) 5 (e) 0 and 8 (f) 7 (1, 2, 4, 5, 6, 7, 9)
(g) 5 (B, C, D, E, K); 7(A, M, T, U, V, W, Y); 4 (H, I, O, X)

(h) its diagonals (i) 3 (j) 10; (F, G, J, L, N, P, Q, R, S, Z)

250 Mathematics-6