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Which kind of cones are formed by rotating on their axis of following triangles? 

a) Equilateral 

b) Right angled 

c) Scalene

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a) Equilateral triangle : Having the altitude of this equilateral as rotating axis, on rotation we get a regular cone, (right cone)

b) Right angled triangle : Having a leg (a side other than hypotenuse) as rotating axis, on rotation of this right angled triangle we get a right circular cone. 

c) Scalene triangle : Having a particular altitude from a vertex as rotating axis, on rotation we get a cone.

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