Two finite rectangles of the same length, having one common edge, and at right angles to each other are shown below.

*Input*- Parameters
*H*&*W*where

- as in diagram
*Equation**Note*- Angles are expressed in radians
*Source*- Siegel(1)
**References**- 1. Siegel R and Howell J R
*Thermal Radiation Heat Transfer*(New York: McGraw Hill) (1972)

## Erratum

The numbering of surfaces 1 and 2 should be reversed in the diagram

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