Question

A small indoor greenhouse ( herbarium ) is made entirely of glass panes including base held together with tape. It is 30cm long, 25cm wide and 25cm high. How much of tape is needed for all the 12 edges?

Answer 1

length of tape required = 4l +4b+4h
                                     =4(30) +4(25)+4(25)
                                     =120+100+100
                                     =320cm

Answer 2

$\huge\underline\text{Answer:}$

• We have,

$\sf{Length=30cm,\:breadth=25cm\:and\:height=25cm}$

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$\therefore$ Area of glass

= Total surface area of a cuboid of length 30cm, breadth 25cm and height 25cm

$\leadsto$$\sf{2(30×25+25×25+30×25)cm^2}$

$\therefore$ $\sf{Surface\:area=(lb+bh+hl)}$

$\leadsto$ $\sf{2(750+625+750)cm^2=4250cm^2}$

__________________

• $\text{Length\:of\:the\:tape=Length\:of\:all\:12\:edges}$

$\Rightarrow$ $\text{4(length+breadth+height)}$

$\Rightarrow$ $\text{4(30+25+25)cm=320\:cm}$