Ex.9-1 A building 25 m by 60 m is to be laid with a 20 m tape which is 0.02 m too long. What ground measurement should be made?

Ex.9-2 A 30 m steel tape weighing 0.75 kg has a cross - sectional are 0.04 cm² is standardarised at 18^o C with 6 kg tension under full support.

(a) A line on a smooth level ground is measured with the tape under a tension of 12 kg at a temperature 25^o C and is recorded as 1543.68 m long. Compute the corrected length. Given E = 2.1 x 10 ⁶ kg / cm ².

(b) The same tape is used to meaner another distance and recorded as 875.62 m over level ground, with tape supported only at the two ends and 6 kg tension. Calculate the corrected length of the line.

Ex.9-3 The dimensions of a rectangular field were measured with a tape and found to be 450 m with a standard error of ± 0.06m and 600m with a standard error of ± 0.05m. Find the area of the field with its probable error.

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