Funnel

The funnel has the shape of an equilateral cone. Calculate the surface wetted with water if we poured into the funnel 7.1 liters of water.

Correct result:

S =  15.6 dm2

Solution:

h2=4r2r2 h=3r  V=13πr2h=13π3r3=7.1 l=7.1 dm3 r=37.1π3=1.58 dm  S=πrs=πr2r=2πr2 S=2π1.582=15.6 dm2



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