elitmus Company Numerical Ability Area and Volume

A table cloth is in the shape of regular decagon(polygon with 10 sides) of side 4ft.it has roses printed on it and spread evently over its entire area. the cloth is draped over a table who is the shape of a regular decagon of side 2 ft. to a person who looks at the table from vertex above and cannot see any portion of the cloths hanging over the side approximately how many can he count?
1. 35 1/2 2. 40 3. 80 4. 20.

Read Solution (Total 4)

we hv big polygon of side 4ft, so area of polygon = (ns^2)*cot(180/n)/4, where n=no. of sides and s=length of each side
so we get area of cloth polygon = 40cot(18)----------->1
now area of table=10cot(18)-------------------->2
area of cloth - area of table=>30cot(18)
so this value is less than 30 from options we have only 20
so answer is 20
10 years agoHelpfull: Yes(11) No(12)

value of cot18 is 3.077 ..answer cant b 20...........
10 years agoHelpfull: Yes(5) No(1)
then what is the ryt soln????
10 years agoHelpfull: Yes(0) No(4)
what wuld b the correct answer admin......!!!
8 years agoHelpfull: Yes(0) No(0)

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