Let be the area of the projection of a plane area on the plane respectively

MATHEMATICS · Single correct · CBSE · Mathematics · Vector Algebra · Vector Algebra

Problem

Let

A_{xy}, A_{yz}, A_{zx}

be the area of the projection of a plane area

A

on the

xy, yz, zx

plane respectively. Then

A^2 =

(1)

A_{xy}^2 + A_{yz}^2 + A_{zx}^2

(2)

\sqrt{A_{xy}^2 + A_{yz}^2 + A_{zx}^2}

(3)

A_{xy} + A_{yz} + A_{zx}

(4)

\sqrt{A_{xy} + A_{yz} + A_{zx}}