Question

find LSA and TSA of a cuboid whose length is 10 centimetres;breadthis 8 centimetres and; height is 5 centimetre

then the formula is 2 h( l + b) square units

Answer 1

LSA of cuboid - 2h ( l + b)
2 x 5 ( 8 + 10)
10 x 18
180 sq cm

TSA = 2 ( lb + bh + lh)
2 ( 10 x 8+ 5 x 8+ 5 x 10)
2 ( 80 + 40 + 50)
2 x 170
340 sq cm

Hope This Helps You!

Answer 2

Lateral Surface Area of cuboid = 2h(l+b)
Total Surface Area of Cuboid = 2 (lb + bh + hl)

Length = 10 centimetres
Breadth = 8 centimetres 
Height = 5 centimetres

L.S.A = 2* 5 (10+8)
= 10(18) = 180 cm².

T.S.A = 2 [(10*8) + (8*5) + (5*10)]

=2(80 + 40 + 50)
=2(170)
=340cm²

Hope this answer helps you