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Perimeter of the Lovely El

Perimeter of the Lovely El. “What is the perimeter of this shape?” (all the angles are 90 degrees ). Perimeter of the Lovely El. “Perimeter: the distance around an area.”. It doesn’t have to be a “regular” shape, either. . The perimeter around Parkland College is 1.45 miles.

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Perimeter of the Lovely El

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  1. Perimeter of the Lovely El “What is the perimeter of this shape?” (all the angles are 90 degrees )

  2. Perimeter of the Lovely El “Perimeter: the distance around an area.”

  3. It doesn’t have to be a “regular” shape, either.

  4. The perimeter around Parkland College is 1.45 miles

  5. “Peri” means “around. 2cm “perinatal” means “happening around the birth time” “perimeter” means “measuring around a shape.” 7cm 8cm 4cm 1cm 6cm

  6. 2units The units have to be the same thing. If one side is measured in centimeters and the other in inches or feet or miles, addingthe numbers together would just give you a number, not the answer to a question.(It’s same to same in the addition game!) 7units 8units 4units 1unit 6units

  7. Perimeter: Add the distances of each side. 2units Notice that you’re measuring a distance, so your starting point is 0, not one. You’re counting the spaces – the distance – not the lines used to mark each unit. 7units 8units 4units 1unit 6units

  8. What if we don’t know all the distances? 0 3units We don’t have to measure them.We can still figure things out, becauseas long as those angles are 90 degree “perfect corners,” we can use what we knowabout Parts and Wholes and… just watch  6units 4units 2units

  9. What if we don’t know all the distances? 0 3units Trace these lines with your finger. They’re “parallel” – going *exactly* the samevertical (up and down) direction. They’d never meet even if they went on forever to infinity. 6units 4units 2units

  10. What if we don’t know all the distances? I’m the whole! Me! 0 3units • Which distance is the whole way from top to bottom? 6units 4units 2units

  11. What if we don’t know all the distances? I’m the whole! Me! 0 3units • The part we’re looking for… where is it? ? I’m the missing *part* 6units 4units 2units

  12. What if we don’t know all the distances? I’m the whole! Me! 0 3units • The part you already know is … where? I’m the missing *part* 6units I’m the part you know! 4units 2units

  13. What if we don’t know all the distances? I’m the whole! Me! 0 3units • To find a part…. Subtract the part from the whole. Whole minus part = part I’m the missing *part* 6units I’m the part you know! 4units 2units

  14. One more time… I’m the whole! Me! 0 • First trace the lines to find the ones going the samedirection. I’m the missing *part* 3units 6units I’m the part you know! 4units 2units

  15. One more time… I’m the whole! Me! 0 • First trace the lines to find the ones going the samedirection. • Next, figure out which are the parts, and which is the whole. 3units I’m the missing *part* 6units I’m the part you know! 4units 2units

  16. One more time… I’m the whole! Me! 0 • First trace the lines to find the ones going the samedirection. • Next, figure out which are the parts, and which is the whole. • Subtract to find a missing part; add to find a whole. 3units I’m the missing *part* 6units I’m the part you know! 4units 2units

  17. You might want to backtrack… 0 • Go through these steps … then figure out the other missing side! I’m the missing *part* I’m the whole! Me! 3units I’m the part you know! 6units 4units 2units ????units

  18. Some other resources • http://www.bbc.co.uk/bitesize/ks3/maths/measures/ • Make all the practice worksheets you want  • http://www.worksheetworks.com/math/geometry/measuring-figures/perimeter-area.html

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