Asked by ijeoma

A cone has a circular base, a perpendicular height of 21cm and a semi vertical angle of 30degree calculate the slant height of the cone.Find the area of it's base [take pie to be 22/7]
Answered by Steve
the slant height s is found using the Pythagorean Theorem:

s^2 = h^2 +r^2
If the angle from the base to the top is θ, then of course the base radius is
r = h tanθ

the area of the base is πr^2

and that's <u>pi</u>, not pie!
Answered by Bimbo
Slant height=42
Answered by Shuaibu
A cone has a circular base perpendicular height of 21cm and semi vertical angel 30 calculate the slant height at the center find the areas of its base
Answered by Oladotun
Slant height is 24cm and the area of it base is 38cm^2
Answered by Abigeal
Am here to find the vertical height of a cone
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