Page 157 - Math_Genius_V1.0_C5_Flipbook
P. 157
E:\Working\Focus_Learning\Math_Genius_5_(05-10-2023)\Open_Files\CHAP_07
\\November 22, 2023 4:45 PM Surender Prajapati Proof 5 Reader _________________________ Date: ___________________74
Some shapes look same even if we give them a half turn.
Original posi�on Half turn Original posi�on Half turn
rotational Symmetry
Rotational symmetry of a figure occurs if it appears the same two or more times during a
complete rotation of 360° about a fixed point.
Q P S R Q
R P Q S P R S Q R P
S R Q P S
Position after Position after Position after Position after
90° turn 180° turn 270° turn 360° turn
The figures that possess rotational symmetry need not necessarily possess line symmetry.
Original Position after Position after Position after
position 120° turn 240° turn 360° turn
Here, the given shape possesses rotational symmetry but no line symmetry.
Think and Answer
What time will be in the clock, if the minute hand take:
1
1. turn? ______________
4
1
2. turn? ______________
2
Practice time 7B
1. Look at each pair of letters. Identify in which pair the second letter slides, flips or
turns.
(a) (b) (c)
(d) (e) (f)
Mathematics-5 155
