Why (160 + 120
) (160 + 120
) is equals to 4? (Give Reason)
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Answer:
Outer dimensions of the box are 10,8,5 respectively.
The thickness of wood is 1cm.
∴ inner dimensions are 10−2,8−2 and 5−1 i.e., 8 cm., 6 cm. and 4 cm.
∴ outer surface area =10×8+2×5(10+8)
=80+180=260cm2
and inner surface area =8×6+2×4(8+6)
=48+112=160cm2
and Area of top =lb−(l−2)(b−2)=10×8−8×6=32
So total SA=260+160+32=452 sq. cm
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