Question

Find theLSA and TSA of a cuboid of length 80cm ,breath40cm , height 20cm

Answer 1

LSA = 2(L+B+H)
=2(80+40+20)
=2(140)
=280CM
TSA=2(LB+BH+LH)
=2(80×40+40×20+80×20)
=2(3200+800+1600)
=2(5600)
=11200CM

Answer 2

l = 80cm
b = 40cm
h = 20cm

LSA = 2 ( l + b + h )
= 2 ( 80 + 40 + 20)
= 2 ( 120 + 20)
= 2 ( 140)
= 280 cm square

TSA = 2 ( lb + bh + lh )
= 2 ( 80 × 40 + 40 × 20 + 20 × 80)
= 2 ( 3200 + 800 + 1600)
= 2 ( 4000 + 1600)
= 2 ( 5600)
= 11,200 cm square

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