Surveying
According to Napier's Rules of circular parts for a right angled triangle, sine of middle part equals the product of

Both (A) and (B) above
Tangents of two adjacent parts
Sines of two adjacent parts
Cosines of two adjacent parts

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Surveying
Homologous points are

Opposite corners of a photograph
Plumb points of stereo pair of photographs
Nodal points of the camera lens
Corresponding points on the ground and photograph

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