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Thermal Expansion

Consider a tr...

Question

Consider a triangle plot $A B C$ with sides $A B = 7 m, B C = 5 m$ and $C A = 6 m$ . A vertical lamp--post at the mid point $D$ of $A C$ subtends an angle $30^{o}$ at $B$ . The height $(i n m)$ of the lamp post is:

A

624

cu.cm

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B

625

cu.cm

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C

700

cu.cm

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D

635

cu.cm

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Solution

The correct option is A $624$ cu.cm
The length , breadth and height of a cuboid are $12$ cm, $8$ cm and $6.5$ cm respectively.Find its volume.
Length of the cuboid $= 12$ cm
Breadth of the cuboid $= 8$ cm
Height of the cuboid $= 6.5$ cm
Volume of the cuboid $=$ length $\times$ breadth $\times$ height
$= 12 \times 8 \times 6.5 = 624$ cu.cm
Hence the volume of the cuboid is $624$ cu.cm

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