5. The total surface area of a cube is 486 cm². Calculate its edge.
6. A cuboid is 10 m long, 7 m wide and 5 m high. Find its total surface area.
7. The whole surface of a rectangular block is 846 cm². Find its dimension if they are proportional to 5:4:3.
8. The dimensions of a wooden box is 14 cm x 18cm x 17 cm and thickness is 1 cm. What are its inner and outer
surface areas.
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Answer:
Step-by-step explanation:
1)a=9cm
2) 2(10×7+7×5+5×10)
2×155
310
total surface area of cuboid=310m^3
3)Let the dimensions be 5x,4x, and 3x
Whole surface
=2(5x×4x+5x×3x+4x×3x)cm2
=94x2cm2
Now 94x2=846cm2(given)
⇒x2=9 or x=3cm
∴ Volume of the room =5x×4x×3x
=60x3=1620square.cm
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