# Orthogonal Projections of the Edges of a Cube

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This Demonstration shows that the sum of the squares of the lengths of the orthogonal projections of the edges of a cube with edge length to a plane equals .

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Contributed by: Izidor Hafner (May 2017)

Open content licensed under CC BY-NC-SA

## Snapshots

## Details

This problem was posed in [1, pp. 20, 27, 28].

Reference

[1] V. V. Prasolov and I. F. Sharygin, *Problems in Stereometry* (in Russian), Moscow: Nauka, 1989.

## Permanent Citation