Question

The inner diameter of a well is 8 m. If the well is 14 m deep,then what is it's volume ?

Answer 1

Answer:

Step-by-step explanation:

Radius of the well (r) = 3/2 m = 1.5 m

Height of the well(h) = 14 m

Volume of the earth taken out of the well = πr2h = 22 7 ×(1.5)2×14 = 99 m3 .

Outer radius of the embankment R = 3/2 + 7 = 17 / 2 m

Area of embankment = outer area - inner area

⇒ πR2 - πr2 = (22/7)(17/2)2 - (22/7)(3/2)2

⇒ 22x17x17/28 - 22x9x9 / 28= 6358 / 28 - 198 / 28

= 6160 / 28 = 220 m2

∴ Height of the embankment = Volume / area = 99 / 220 = 9/20 = 0.45 m.

Hope dis helps u

Answer 2

$volume \: of \: well=π {r}^{2} h \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 22 \div 7 \times {4}^{2} \times 14 \: \: \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 22 \times 16 \times 2 \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 44 \times 16 \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 704 {m}^{2} answer....$