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# Measurements area and volume

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### Measurements area and volume

1. 1. Measurement and Units Measuring Area and Volume
2. 2. Measuring Area <ul><li>Area is a quantity to express part of a surface. </li></ul><ul><li>SI unit : m 2 </li></ul><ul><li>Area is needed to determine size of land. </li></ul><ul><li>Painters use area to determine the amount of paint to use. </li></ul>
3. 3. Measuring Area <ul><li>Regular Figures </li></ul>L x L L x h ½ x b x h  x r 2
4. 4. Measuring Area <ul><li>Irregular Figures </li></ul><ul><li>Estimate area using a square grid made up of many 1cm 2 </li></ul>1cm 1cm             Number of ticks = 12 Area = 12cm 2 (approx.)
5. 5. Measuring Area <ul><li>How to measure irregular figures more accurately </li></ul>1 x 1cm 2 = 1cm 2 (approx) 9 x 0.25cm 2 = 2.25cm 2 (approx)          
6. 6. Measuring Volume <ul><li>Regular Objects </li></ul>L x L x L  r 2 x h (1/3)  x  r 2 x h (1/3)  x base area x h
7. 7. Measuring Volume <ul><li>Irregular Objects </li></ul><ul><li>Estimate volume by using displacement of water </li></ul>Pour liquid into measuring cylinder Volume of liquid = 20cm 3 Volume of Object = 20cm 3
8. 8. Conclusion <ul><li>Area </li></ul><ul><li>Formulas for regular shaped </li></ul><ul><li>Tick Estimation for irregular shapes </li></ul><ul><li>Volume </li></ul><ul><li>Formulas for regular object </li></ul><ul><li>Overflow can for irregular objects </li></ul>