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Siddharth Tirumala
Ryan Christianson
B4 Math
ï‚¡   Our goal was to find out the height of the
    soccer net.
ï‚¡   We did this by using indirect measurement.
ï‚¡   Height of:
     oRyan: 174 cm
     oSiddharth: 158 cm
ï‚¡   Length of:
     oRyan’s Shadow: 100 cm
     oSiddharth’s Shadow: 90 cm
   Length of Soccer Net’s Shadow: 155 cm
This is a picture of the scenario:




                                            Height (Ryan: 174 cm) Siddharth: 158 cm
   (Side of soccer net)




                          Shadow (155 cm)         Shadow (Ryan: 174 cm Siddharth: 158 cm)
ï‚¡   Similar: Corresponding angles are equal in
    measure
ï‚¡   The triangles that were formed in the last
    slide are similar
ï‚¡   Triangles are similar because their corresponding
    angles are equal in measure
ï‚¡   We know this because:
      oThere is a right angle, which we know is 90
       degrees
      oAlso, since the light was coming at the same angle
       for both us and the soccer net, the top angles
       must be equal in measure.
      oSo, if two angles in two triangles are equal to each
       other, then the third angles must also be equal
      oTherefore, the triangles are similar
ï‚¡   Since we knew that the triangles were similar, we
    could set up a proportion:
      oWe did it for both of our heights.
    Using Ryan’s height:




Using Siddharth’s height:
ï‚¡   We got different answers for each of us, so
    we found the average between the two
    answers
ï‚¡   We got 270.9 cm as our answer
ï‚¡   So, the height of the soccer net is
    approximately 270.9 cm.
ï‚¡   We may not be 100 percent exact on the
    measurements
ï‚¡   The length of the shadow changes throughout the
    day because it depends on where the sun is in the
    sky.
      oSo if we had taken the measurements later or
        earlier in the day, the lengths of the shadows
        may have been different.

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Indirect measurement project

  • 2. ï‚¡ Our goal was to find out the height of the soccer net. ï‚¡ We did this by using indirect measurement.
  • 3. ï‚¡ Height of: oRyan: 174 cm oSiddharth: 158 cm ï‚¡ Length of: oRyan’s Shadow: 100 cm oSiddharth’s Shadow: 90 cm ï‚¡ Length of Soccer Net’s Shadow: 155 cm
  • 4. This is a picture of the scenario: Height (Ryan: 174 cm) Siddharth: 158 cm (Side of soccer net) Shadow (155 cm) Shadow (Ryan: 174 cm Siddharth: 158 cm)
  • 5. ï‚¡ Similar: Corresponding angles are equal in measure ï‚¡ The triangles that were formed in the last slide are similar
  • 6. ï‚¡ Triangles are similar because their corresponding angles are equal in measure ï‚¡ We know this because: oThere is a right angle, which we know is 90 degrees oAlso, since the light was coming at the same angle for both us and the soccer net, the top angles must be equal in measure. oSo, if two angles in two triangles are equal to each other, then the third angles must also be equal oTherefore, the triangles are similar
  • 7. ï‚¡ Since we knew that the triangles were similar, we could set up a proportion: oWe did it for both of our heights. Using Ryan’s height: Using Siddharth’s height:
  • 8. ï‚¡ We got different answers for each of us, so we found the average between the two answers ï‚¡ We got 270.9 cm as our answer ï‚¡ So, the height of the soccer net is approximately 270.9 cm.
  • 9. ï‚¡ We may not be 100 percent exact on the measurements ï‚¡ The length of the shadow changes throughout the day because it depends on where the sun is in the sky. oSo if we had taken the measurements later or earlier in the day, the lengths of the shadows may have been different.