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=31 π r2 h=31 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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Tips for related online calculators
Tip: Our volume units converter will help you convert volume units.
The Pythagorean theorem is the base for the right triangle calculator.
Calculation of an equilateral triangle.
See also our trigonometric triangle calculator.

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