Math, asked by shivam451, 1 year ago

what is area of cardboard needed to make rectangular box 12cm long ,2cmwide and 5cm high

Answers

Answered by Anonymous

hope this helps u.....

Attachments:

Anonymous: TSA of new cube=6(3x/2)sq.

Anonymous: =6(9x/4)

Anonymous: sorry 6(9x sq./4)

Anonymous: =13.5x sq.

Anonymous: increase in area=13.5 x sq.-6x sq. =7.5x sq.

Anonymous: 7.5x sq. increase%= 7.5x sq./6x sq× 100 =125%

Anonymous: ok

shivam451: n electric heater of 1000watt is use for 3 hour for a day . what is cost of using in a month of 25 day . If unit cast equal rupee 4.

Anonymous: i have not done this type of questions

Anonymous: sorry

Answered by mysticd

$\underline { \blue { Dimensions \:of \: a \: rectangular \:box : }}$

$Length (l) = 12 \:cm,\\width(w) = 2 \:cm\:and \\Height (h)$

$Area \: of \: the \: cardboard \\ needed \:to \: make \:rectangular \: box \\= Total \: surface \:area\:of \:the \:box \\= \pink {2( lw + wh + hl )}</p><p>\\= 2(12\times 2 + 2 \times 5 + 5 \times 12 ) \\= 2( 24 + 10 + 60 ) \\= 2 \times 94 \\= 188 \:cm^{2}$

Therefore.,

$\red { Area \: of \:the \: cardboard \: needed}\\ \green {= 188\:cm^{2} }$

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