Please can you help me out

Dear Student,
Ans 4.
To measure the length of the pencil using the broken scale,
1. Put the broken end of the scale touching the base of the pencil.
2. Mark the scale reading where the tip of the pencil lies.
3. Subtract the reading of the scale at the tip with the base reading, i.e., 2.6 cm.

Measurement of length is relative. With a normal scale, the reading of the length of the pencil would be (tip reading - base reading) and the base reading i.e., the reading of the scale where the base of the pencil lies is 0. So, the tip reading stands equal to the final length of the pencil.
However, with a broken scale, the base reading is 2.6 cm and so it has to be subtracted with the tip reading to determine the length fo the pencil.
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