Question

Ashima has wooden box whose dimensions are 80 cm, 40 cm and 20cm. She wants to cover the box with square coloured paper of side 40 cm. How many square sheets of coloured paper are required.​

Answer 1

☆Answer☆

Given :-

length of the cuboidal box = 80cm

breadth of the cuboidal box = 40cm

height of the cuboidal box = 20cm

Total surface area of a cubiod = 2(lh + bh + lh)

= 2(80 × 40 + 40 × 20 + 80 × 20)

= 2(3200 + 800 + 1600)

= 2(5600)

= 11200cm²

To find

Area of a sheet (Sheet is in rectangular shape)

Area of a Rectangle = side × side

$= > side {}^{2}$

= 40²

= 40 × 40

= 1600cm².

therefore no. of sheets required to cover the cuboidal box = 11200/1600

= 7

hence, 7 sheets are required.

☆Brainly Extra Knowledge ☆

Formulae

1. Area of rectangle = Side × Side

2. Total surface area of a cubiod = 2(lh + bh + lh)

Answer 2

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Ashima has wooden box whose dimensions are 80 cm, 40 cm and 20cm. She wants to cover the box with square coloured paper of side 40 cm

$\tt\it\bf\it\large\bm{\mathcal{\fcolorbox{blue}{white}{\blue{Given:-}}}}$

➠ length of wooden box ➨ 80cm

➠ breadth of wooden box ➨ 40cm

➠ height of wooden box ➨ 20cm

➠ Square coloured paper of side

➨ 40cm

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➠ no.of square sheets of coloured

paper?

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➠ T.S.A of cuboid ➨ 2(lb+bh+hl)

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_____________________________

T.S.A of cube ➨ 2(80x40+40x20+20x80)

➠ 2(3200 + 800 + 1600 )

➠ 2( 5600 )

➠ 11200cm²

Area of squared colour paper ➨ 40 x 40

➨ 1600cm²

•°• Total no.of squared colour sheet

➨ 11200/1600

➨ 7

$\tt{\pink{\:Hence,\;Total\;no.of\;colour\;sheet\:}}$

$\tt{\pink{ \:required=7 }}$

_____________________________

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➠ L.S.A of Cuboid ➨ 2h(l+b)

➠ Volume of Cuboid ➨ L x B x H

➠ Length of Diagonal of Cuboid

$= > \sqrt({ {l}^{2} } + {b}^{2} + {h}^{2} )$

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➠ RD Sharma

➠ RS Aggarwal

➠ Ncert

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