Axial section

Calculate the volume and surface of a cone whose axial section is an equilateral triangle with side length a = 18cm.

Correct answer:

V =  1322.2597 cm3
S =  763.407 cm2

Step-by-step explanation:

a=18 cm  r=a/2=18/2=9 cm h=3/2 a=3/2 18=9 3 cm15.5885 cm  V=13 π r2 h=13 3.1416 92 15.5885=1322.2597 cm3
s=a=18 cm  S=π r2+π r s=3.1416 92+3.1416 9 18=763.407 cm2



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