question_answer 1)

                Rukhsar painted the outside of the cabinet of measure \[1\text{ }m\times 2\text{ }m\times 1.5\text{ }m\]. How much surface area did she cover if she painted all except the bottom of the cabinet.

Answer:

                \[l=1\,m\] \[b=2\,m\] \[h=1.5\,m\] Required area \[=2(l\times b+b\times h+h\times l)-l\times b\] \[=2(1\times 2+2\times 1.5\,+1.5\times 1)\,{{m}^{2}}-(1\times 2)\,{{m}^{2}}\] \[=13\,{{m}^{2}}-2\,{{m}^{2}}\] \[=11\,\,{{m}^{2}}\] Hence, she covered \[=11\,\,{{m}^{2}}\] of surface area.