Biswas mde a box 20cm long, 15 cm broad, and 10cm high but without a lid. How mach cardboard did he use for it ?
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l = 20cm
b= 15cm
h= 10cm
curved surface area = 2h (l+b)
= 2×10(20+15)
= 20×35
=700cm square
b= 15cm
h= 10cm
curved surface area = 2h (l+b)
= 2×10(20+15)
= 20×35
=700cm square
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