Question

isometric projection of sphere is

Answer 1

Simply circle whose diameter is equal to the true diameter of the sphere.

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Answer 2

The isometric drawing of the sphere is a circle whose diameter is (3/2) times that of the actual diameter of the sphere. The isometric projection of the sphere is simply a circle whose diameter is equal to the true diameter of the sphere.

It is important when drawing in an isometric drawing that the circle drawn is an isometric drawing and not an isometric projection of the sphere.

If a isometric projection of a sphere is drawn in an isometric drawing then the drawing will be distorted as the sphere will appear smaller than it should.

In axonometric the sphere will always project as a circle.

The radius of this circle will be the radius of the sphere.