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In perspective projection, the horizontal plane in which the object is assumed to be situated is called ______________

(a) horizontal plane

(b) picture plane

(c) ground plane

(d) auxiliary ground plane

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I need to ask this question from Definitions and Methods of Perspective Projections in division Oblique & Perspective Projection of Engineering Drawing

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The correct choice is (c) ground plane

Explanation: In perspective projection, the horizontal plane in which the object is assumed to be situated is called ground plane. And the imaginary plane is at the level of the eye above the ground plane and at right angles to the picture plane is called the horizontal plane.

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