Question

2
The volume of a soap cake is 140 cm. Its length and width are 7 cm and 5 cm. Find its height.
The surface area of a cube is 384 cm2. Find its volume.
The volume of a cube is 1728 m3. Find its surface area.​

Answer 1

Answer:

sol

we know that

length * breadth *height = volume

7 * 5 * x =140cm

35x=140cm

x= 4cm

Answer 2

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1)since we know that :-Volume = Length * Breadth * Height

so 140 = 7 * 5 * h

now 140 = 35 * h

so 140 / 35 = h

therefore 4 cm = Height

2) V = 512 cm³

3)We have given that

Volume of cube = 1728 cm³

We have to find

Surface area of cube= ?

Solution:-

We know that

Volume of cube = a³

Where a is length of side of cube

And

Surface area of cube = 6a²

According to question

=> a³ = 1728 cm³

=> a = 12 cm

Now

Surface area of cube = 6 a²

= 6 (12)² = 144 ×6

= 864 cm ² answer

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