Question

A small indoor greenhouse (herbarium) is made entirely of glass panes (including base) held together with tape . It is 30 cm long.25cm 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?​

Answer 1

Answer:

Since the herbarium is made entirely of glass panes (including base) held together with tape, the length of the tape which is needed for all the 12 edges will be the same as the sum of the lengths of all the 12 edges. Thus, the area of the glass is 4250 cm2, and the tape needed for all the 12 edges is 320 cm.

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

(i) Area of glass = total surface area of greenhouse

 = 2 (lb + bh + lh)

= 2 (30 * 25 + 25 * 25 + 30 * 25)

 = 2 (750 + 625 + 750)

= 4250 cm2

Therefore, area of glass is 4250 cm2.

(ii) Length of tape needed = perimeter of the greenhouse



 = 4 (l + b + h)

 = 4 (30 + 25 + 25) cm

 = 320 cm.

Therefore, the length of tape needed is 320 cm.

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