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The number of all possible angles is infinite and no figure can show them all.
Positive zero error means, instead showing zero it shows some value more than zero. Hence positive. Suppose if it shows some reading say 0.03 units. then while correcting we have to subtract the above from the observed reading. So correction is adding negative error.
Zero error is defined as the condition where a measuring instrument registers a reading when there should not be any reading. In case of Vernier calipers it occurs when a zero on main scale does not coincide with a zero on Vernier scale. Source: calculatored and written by Shaun Murphy
A change in the reading of a thermometer from -20 to -10 degrees represents a rise in temperature of 10 degrees. Another way to say this is that the temperature changed by +10 degrees.
12. The ratio of day time show is 2:5 to the total shows. Hence when the total show is 30 the day shows is twelve.