. Elementary physics and chemistry: first stage. Science. MEASUREMENT OF AREA. 27. The size of a square centimetre is compared with the size of a square inch in Fig. 14. You will see that a square inch is much larger than a square centimetre. Each A E B side of the square inch is 2'54 centi- metres in length, so the number of square centimetres in a square inch _^ is 2'54 X 2"54 —6'45 or nearly 6h square centimetres. To BE Remembered. Area is found by measuring length in two directions. A foot square is a square which has each side one foot in length. Square Measure is derived from Long M
. Elementary physics and chemistry: first stage. Science. MEASUREMENT OF AREA. 27. The size of a square centimetre is compared with the size of a square inch in Fig. 14. You will see that a square inch is much larger than a square centimetre. Each A E B side of the square inch is 2'54 centi- metres in length, so the number of square centimetres in a square inch _^ is 2'54 X 2"54 —6'45 or nearly 6h square centimetres. To BE Remembered. Area is found by measuring length in two directions. A foot square is a square which has each side one foot in length. Square Measure is derived from Long Measure ; it tells the standards which nnist be used in measuring areas. Square Inches and Square Centimetres. —As 2'54 cm. = I inch, the number of square centimetres in i square inch is 2'54 X 2"54 = 6'45, or -\-ery nearly 6i square centimetres. Exercise VII. I. Wbat measurements of a wall must we know before we can tell how much paper will be required to cover it ? F Fig. 14.—A incli conuiins 6"45 square centimetres. Fig. 13.—Square centimetres and square millimetres. Ten rows of ten square centimetres make one square decimetre. 2. How many square inches are there in a square foot, and how many in a square yard ? 3. How many square centimetres in a square metre, and how many in a square decimetre ? 4. How many square millimetres in a square decimetre? How square millimetres in a square metre ?. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gregory, R. A; Simmons, A. T. London: MacMillan
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