Cone side

Calculate the volume and area of the cone whose height is 10 cm and the axial section of the cone has an angle of 30 degrees between height and the cone side.

Correct result:

V =  349.066 cm3
S =  314.159 cm2

Solution:

h=10 cm A=30 rad=30 π180 =30 3.1415926180 =0.5236=π/6  tanA=r:h  r=h tan(A)=10 tan(0.5236)5.7735 cm  S1=π r2=3.1416 5.77352104.7198 cm2  V=13 S1 h=13 104.7198 10=349.066 cm3h=10 \ \text{cm} \ \\ A=30 ^\circ \rightarrow\ \text{rad}=30 ^\circ \cdot \ \dfrac{ \pi }{ 180 } \ =30 ^\circ \cdot \ \dfrac{ 3.1415926 }{ 180 } \ =0.5236=π/6 \ \\ \ \\ \tan A=r:h \ \\ \ \\ r=h \cdot \ \tan(A)=10 \cdot \ \tan(0.5236) \doteq 5.7735 \ \text{cm} \ \\ \ \\ S_{1}=\pi \cdot \ r^2=3.1416 \cdot \ 5.7735^2 \doteq 104.7198 \ \text{cm}^2 \ \\ \ \\ V=\dfrac{ 1 }{ 3 } \cdot \ S_{1} \cdot \ h=\dfrac{ 1 }{ 3 } \cdot \ 104.7198 \cdot \ 10=349.066 \ \text{cm}^3
s=h2+r2=102+5.7735211.547 cm S2=π r s=3.1416 5.7735 11.547209.4395 cm2 S=S1+S2=104.7198+209.4395=314.159 cm2s=\sqrt{ h^2+r^2 }=\sqrt{ 10^2+5.7735^2 } \doteq 11.547 \ \text{cm} \ \\ S_{2}=\pi \cdot \ r \cdot \ s=3.1416 \cdot \ 5.7735 \cdot \ 11.547 \doteq 209.4395 \ \text{cm}^2 \ \\ S=S_{1}+S_{2}=104.7198+209.4395=314.159 \ \text{cm}^2



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