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 The area of glass is:

• A. $5000c{m}^2$
• B. $4800c{m}^2$
• C. $4250c{m}^2$
• D. $4500c{m}^2$

Answer 1

The correct option is C $4250c{m}^2$

Since the greenhouse is cuboidal in shape, we need to calculate its total surface area by applying the formula.

Total surface area of a cuboid $=2(l\times b+b\times h+l\times h)$

Given:-

$l=30cm$

$b=25cm$

$h=25cm$

Hence, the total surface area of the herbarium will be,

$S=2(30\times 25+25\times 25+30\times 25)$

$=2(750+625+750)$

$=2\left(2125\right)$

$=4250c{m}^2$