alleryWhat is the smallest turn after which a four-bladed windmill firki looks the same?
AA full turn
BA third of a turn
CA quarter turn
DA half turn
Answer & Solution
Correct answer: C. A quarter turn
1. A firki has four identical blades spaced equally.
2. After a quarter turn each blade takes the place of the next one.
3. So the firki looks the same after a quarter turn, then after every further quarter turn.
_Source: NCERT Maths Mela Class 5, Ch 10 Symmetrical Designs (ncert.nic.in/textbook/pdf/eemm110.pdf), Let Us Make a Windmill Firki_
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