Question

If an edge of a square is increased by 10%,then by how much will its surface area be increased?

Answer 1

increasing a certain thing 'to' or 'by' do u understand the differnce in both of them ?????

Answer 2

tell me asap

Answer 3

by

Answer 4

'by' means certain fraction of total is increased or decreased here in this case it is increased

Answer 5

it means here u hav to increase or add the that fraction (10/100) to the initial edge of square

Answer 6

that is 10/100 = 0.1 (fraction of total )

Answer 7

do u knw the formula of surface area of square?

Answer 8

6(s*s)

Answer 9

only s*s

Answer 10

k gud u knw that

Answer 11

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

Answer 12

follow till here ?

Answer 13

k

Answer 14

now tell me what is the surface area of sq. with new edge length 1.1????????

Answer 15

m singh plss reply??????????/

Answer 16

wait i m understanding vat u did

Answer 17

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.

Answer 18

@ZeHanz PLS. DON'T GIVE DIRECT ANSWER

Answer 19

@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 ;)

Answer 20

(1.1a)^2

Answer 21

bt i also encourage the way u deliver that in steps...........gd to see that

Answer 22

i think u both have well explained @manishsatywali and @ZeHanz

Answer 23

now have you got the idea...........i mean u reach the final answer any difficulty with the method??????????

Answer 24

no of course thank u @manishsatywali and @ZeHanz

Answer 25

@ZeHanz .........our combo helped @msingh......it's the best we can make out of openstudy

Answer 26

@manishsatywali: thank you!