An empty cylindrical tank is 140 cm in diameter. If 200 l...
An empty cylindrical tank is 140 cm in diameter. If 200 litres of water was poured into the tank. Calculate, correct to the nearest centimeter, the height of the water in the tank. (Takeπ=227)
91cm
7cm
13cm
57cm
Correct answer is C
given that diameter = 140cm ⇒radius = 70cm, volume of cylinder = 200litres = 200,000cm3
volume of cylinder = base area times height = πr2h
200,000cm3=227×70×70×h
200,000=107,800h7
cross multiply
1,400,000 = 107,800h
h=1,400,000107,800
= 13cm (to the nearest cm).