The conical

The conical candle has a base diameter of 20 cm and a side of 30 cm. How much dm ^ 3 of wax was needed to make it?

Correct result:

V =  2.9619 dm3

Solution:

D=20 cm s=30 cm  r=D/2=20/2=10 cm h=s2−r2=302−102=20 2 cm≐28.2843 cm  V1=13⋅ π⋅ r2⋅ h=13⋅ 3.1416⋅ 102⋅ 28.2843≐2961.922 cm3  V=V1→ dm3=V1/1000  dm3=2961.922/1000  dm3=2.962 dm3=2.9619 dm3

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