The large hand of a clock is 42cm long.How many centimetres does it extremity move in 20 minutes?
Gurwinder Kaur , 14 Years ago
Grade 12
Trigonometry> plz help...
2 Answers
sushant singh
hi gurwinder
20 minutes means 4 x 30o = 120o
so if you calculate the sector circumference , you will get the answer as
2 x Pi x R (120/360) = 2 x 22 /7 x 42 x 1/3 = 88 cm Ans.
Approved Last Activity: 14 Years ago
n o
now radius(R)= 42cm
cicum(C)=2pi*42=264cm
in 1 min...a distance of '1C' or 264 cm is covered
so in 20mins.... 20C=20*264=5280cm is covered..
plz approve by clicking 'yes'
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