- 6 m
3. The length, breadth and height of a cuboid
in the ratio 6:3:2. If its lateral surface area
144 dm', find its volume and total surface area.
Answers
Answer: volume=72√10 cm^3
tsa=2880 cm^2
Step-by-step explanation:
LSA of cuboid = 2h(l+b)
let common multiple of all sides be=x
so,
l=6x
b=3x
c=2x
ATQ,
1440=2(2x)(6x+3x) {1dm=10cm}
1440=(4x)(9x)
1440=36x^2
1440/36=x^2
120/3=x^2
40=x^2
2√10=x
so,
volume of cuboid=lbh
=(6×2×3)x
=36x
=36×2√10
=72√10 cm^3
now,
tsa of cuboid=2(lb+bh+hl)
=2{ (18x^2)+(6x^2)+(12x^2)}
=2(36x^2)
=2(36×40) {x=2√10}
=2(1440)
=2880 cm^2