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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. (i) What is the area of the glass?

Solution:

Given: l=30, b=25, h=25
(i) Total surface area of greenhouse = 2(lb + bh + lh) = 2(30 × 25 + 30 × 25 + 25 × 25) = 4250 cm²
(ii) For 12 edges: Total length = 4l + 4b + 4h = 4(30 + 25 + 25) = 320 cm