1.

Biswas made a box 20 cm long 15 cm broad and 10 cm height but without lid how much cardboard did he use for it?

Answer»

HERE LENGTH(L)=20 cm
Breadth(B)=15 cm
Height(H)=10cm
CARDBOARD use=area of four walls+area of base
⇒2(l+b)h+lb
⇒2(20+15)10+20×15
⇒2×35×10 +300
⇒700+300
⇒1000 cm²


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