Question

Find the lateral surface area and total surface area of a cuboid of length 80cm,breadth 40cm , height 20cm

Answer 1

LENGTH(l)=80 cm
BREADTH(b)=40 cm
HEIGHT(h)=20 cm
TSA OF CUBOID = 2(lb+bh+lh)
                             = 2[(80*40)+(40*20)+(20*80)] cm²
                             =2[3200+800+1600] cm²
                             =2[5600] cm²
                             =11200 cm²
LSA OF CUBOID=2(l+b)h
                            =2(80+40)20 cm²
                            =2(120)20 cm²
                            =40(120) cm²
                            =480 cm²
                            

Answer 2

FOR CUBOID Length(L)=80cm Breath(B)=40cm

Height(H)=20cm There for lateral surface area of the Cube x =2(L+B)h. =2(80cm+40cm)20cm

=2×120cm×20cm

=4800cm²

And total surface area=2(LB+BH+LH)

=2(89×40cm²+40×20cm²+80×20cm)

=2(3200+800+1600)

=2×5600cm²

=11,200. ANSWERS