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6.A small indoor greenhouse (herbarium) is made entirely of glass panes (includingbase) held together with tape. It is 30 cm long, 25 cm wide and 25 cm high.What is the area of the glass?How much of tape is needed for all the 12 edges?(1)Key

Answer»

Area of the GLASS = T.S.A of the glass

T.S.A of the glass = 2(lb + bh + lh)

= 2 ( 30×25+25×25+30×25 ) CM^2

= 2 ( 750 + 625 + 750 )cm^2

= 2 × 215 cm^2

= 430 cm^2

Tape needed for all = 4 ( l + b + H )

= 4 ( 30+25+25 ) cm

= 4 × 80 cm

= 320 cm

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