Question

find the radius of a cylindrical water tank would capacity is 6930 cm³ .square it height is 20 CM.
solve this answer 10.5 ​

Answer 1

$\huge{\underline{\underline{\mathfrak{Answer :}}}}$

The correct answer is 1.5 cm

_____________________

$\huge{\underline{\underline{\mathfrak{Explanation :}}}}$

It is given that ;

• Capacity of tank (Volume) = 6930 cm³
• Height of the tank = 20 cm.

We know that,

$\large{\implies{\underline{\boxed{\rm{Volume = \pi r²h}}}}}$

_____________[Putting Values]

$\sf{\longrightarrow 6930 = \dfrac{22}{7} \times r² \times 20} \\ \sf{\longrightarrow \dfrac{\cancel{6930}}{\cancel{7}} = 22 \times 20 \times r²} \\ \sf{\longrightarrow \dfrac{\cancel{990}}{\cancel{22} \times 20} = r²} \\ \sf{\longrightarrow r² = 2.25} \\ \sf{\longrightarrow r = 1.5 }$

$\therefore$ The radius of the tank is 1.5 cm.