Length and Perimeter. Measurements All measurements are only approximations. No measurement is ever exact. Using a ruler with 0.5cm marking, We might.

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Presentation transcript:

Length and Perimeter

Measurements All measurements are only approximations. No measurement is ever exact. Using a ruler with 0.5cm marking, We might measure this eraser to be 5.5 cm long. If we used a more precise ruler, with 0.1 cm markings, then we find the length to be 5.4 cm. If we used a micrometer that measured to the nearest 0.01 cm, we may find that the measured length is 5.41 cm. All measurements are approximations.

Limit of Accuracy The Limit of Accuracy of a Measuring Instrument are +/- 0.5 of the unit shown on the instrument’s scale

Perimeter The Perimeter of a shape is the distance around the shape. It is the sum of the lengths of the sides of the shape

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