plz answer this as fast as you can
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Well its very easy
We know that the lamps shade is made up of 4 triangular pieces of cloth
and the sides and the sides of each piece (triangle ) is given to be 15cm, 15cm, 18cm.
We know that semi perimeter=a+b+c/2
where a, b , c are the sides of a triangle
therefore semiperimeter(s)= 15+15+18/2=24
Hence by herons formula we get
Area = [s(s-a)(s-b)(s-c)]^1/2
Area=[24(24-15)(24-15)(24-18)]^1/2
Area=[24*9*9*6]^1/2
Area=108 cm^2
But we are told that lamp shade is made up of 4 triangular pieces
therefore we get =108*4=432cm^2
But 18 cm^2 cloth was wasted while cutting
hence we get 432-18=414cm^2
which is equal to 0.0414m^2
and hence the cost of cloth = 0.0414*520=21.5280
hence the cost of the cloth is 21.528 i.e. 21.53 rupess
hope this helped u :-)
We know that the lamps shade is made up of 4 triangular pieces of cloth
and the sides and the sides of each piece (triangle ) is given to be 15cm, 15cm, 18cm.
We know that semi perimeter=a+b+c/2
where a, b , c are the sides of a triangle
therefore semiperimeter(s)= 15+15+18/2=24
Hence by herons formula we get
Area = [s(s-a)(s-b)(s-c)]^1/2
Area=[24(24-15)(24-15)(24-18)]^1/2
Area=[24*9*9*6]^1/2
Area=108 cm^2
But we are told that lamp shade is made up of 4 triangular pieces
therefore we get =108*4=432cm^2
But 18 cm^2 cloth was wasted while cutting
hence we get 432-18=414cm^2
which is equal to 0.0414m^2
and hence the cost of cloth = 0.0414*520=21.5280
hence the cost of the cloth is 21.528 i.e. 21.53 rupess
hope this helped u :-)
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