Question

Small indoor green house is made entirely of glass panes held together with tape It is 30 cm long 25 wide 25 meter high Find surface area of glass
panes​

Answer 1

Given: Dimensions of herbarium:

l = 30 cm, b = 25 cm, h = 25 cm

i) Area of the glass=Total surface area of herbarium

 = 2(lb + bh + lh)

= 2(30×25 + 25×25 + 25×30)

= 2(750+625+750)

=2×2125

= 4250cm²

(ii) herbarium in in the shape of cuboid.

So Length of the required tape will be equal to total length of edges of cuboid.

Length of the tape= 4(l + b + h)

= 4(30 + 25 + 25) = 4× 80

= 320 cm.

 

Tape needed for all the 12 edges=320 cm

Answer 2

$\huge{\underline{\sf{\orange{ Solution-}}}}$

Given : ${\sf{l = 30 cm}}$

• ${\sf{b = 25 cm}}$

• ${\sf{h = 25 cm}}$

i) What is the area of the glass?

Area of glass = 2(lb + bh + lh)

${\sf{= 2(30\times25+25\times25+25\times30}}$

${\sf{= 2(750+625+750}}$

${\sf{ = 2(2125)}}$

${\sf{\blue{= 4250\:{cm}^{2}}}}$

ii) How much of tape is needed for all the 12 edges?

Length of tape = ${\sf\blue{4(l + b + h) }}$

${\sf{= 4(30+25+25)}}$

${\sf{= 4(80)}}$

${\sf\blue{=320 cm}}$