A small indoor greenhouse (herbarium)...

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

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(i) area of indoor greenhouse
`=lb+2(bh+hl)`
`=2(30xx25+25xx25+25xx30)`
`=4250cm^2`
(ii) total length of tape`=4l+4b+4h`
`=4xx30+4xx25+4xx25`
`=120+200`
`=320cm`

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