## 26. The resection by two point problem as compared to three point problem

## 27. The angular distance of a heavenly body from the equator, measured along its meridian, is called

## 28. The station where observations are not made, but the angles at the station are used in triangulation series, is known as

## 29. The scale of a tilted photograph of focal length f taken from an altitude H, along the plate parallel through principal point is

## 30. The equation which is obtained by multiplying each equation by the coefficient of its unknowns and by adding the equations thus formed, is known as

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