msingh
If an edge of a square is increased by 10%,then by how much will its surface area be increased?
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manishsatywali
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increasing a certain thing 'to' or 'by' do u understand the differnce in both of them ?????
manishsatywali
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tell me asap
msingh
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by
manishsatywali
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'by' means certain fraction of total is increased or decreased here in this case it is increased
manishsatywali
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it means here u hav to increase or add the that fraction (10/100) to the initial edge of square
manishsatywali
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that is 10/100 = 0.1 (fraction of total )
manishsatywali
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do u knw the formula of surface area of square?
msingh
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6(s*s)
msingh
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only s*s
manishsatywali
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k gud u knw that
manishsatywali
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now see let us suppose we hav the edge of sq. initially be 1 ..then by the defination of 'by' that i hav told u above u can add fraction (0.1) to 1
that is nw the final edge length is 1.1
manishsatywali
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follow till here ?
msingh
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k
manishsatywali
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now tell me what is the surface area of sq. with new edge length 1.1????????
manishsatywali
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m singh plss reply??????????/
msingh
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wait i m understanding vat u did
ZeHanz
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Area of square with edge a is a².
Edge of new square is a+10% of a = a + 0.1a = 1.1a.
Area of new square is (1.1a)²=1.21a² = a² + 0.21a² = a² + 21% of a².
So it is 21 % more.
manishsatywali
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@ZeHanz PLS. DON'T GIVE DIRECT ANSWER
ZeHanz
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@manishsatywali : Just thought you had done enough to explain.
Sometimes it is better to write the whole thing down, to show the steps.
If I had done this right away, I would agree with you ;)
msingh
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(1.1a)^2
manishsatywali
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bt i also encourage the way u deliver that in steps...........gd to see that
msingh
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i think u both have well explained @manishsatywali and @ZeHanz
manishsatywali
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now have you got the idea...........i mean u reach the final answer any difficulty with the method??????????
msingh
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no of course thank u @manishsatywali and @ZeHanz
manishsatywali
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@ZeHanz .........our combo helped @msingh......it's the best we can make out of openstudy
ZeHanz
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@manishsatywali: thank you!