Cone area and side

Calculate the surface area and volume of a rotating cone with a height of 1.25 dm and 17,8dm side.

Correct result:

S =  1983.3983 dm2
V =  412.6973 l

Solution:

h=1.25 s=17.8 r=s2−h2=17.82−1.252≐17.7561 S1=π⋅ r2=3.1416⋅ 17.75612≐990.4735 S=S1+π⋅ r⋅ s=990.4735+3.1416⋅ 17.7561⋅ 17.8=1983.3983 dm2
V=S1⋅ h/3=990.4735⋅ 1.25/3=412.6973 l

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