Area of Frustum of Cone – Formula and Derivation

Here you will learn formula for the total surface area and curved surface area of frustum of cone with derivation and examples. Let’s begin – What is Frustum of Cone ? Frustum of a cone is the solid obtained after removing the upper portion of the cone by a plane parallel to its base. The […]

Volume of a Frustum of a Cone – Formula and Derivation

Here you will learn formula for the volume of a frustum of a cone with derivation and examples based on it. Let’s begin –  What is Frustum of Cone ? Frustum of a cone is the solid obtained after removing the upper portion of the cone by a plane parallel to its base. The lower

Directrix of Hyperbola – Equation and Formula

Here you will learn formula to find the equation of directrix of hyperbola with examples. Let’s begin – Directrix of Hyperbola Equation (i) For the hyperbola $$x^2\over a^2$$ – $$y^2\over b^2$$ = 1 The equation of directrix is x = $$a\over e$$ and x = $$-a\over e$$ (ii) For the hyperbola -$$x^2\over a^2$$ + \(y^2\over