12G
  • 12G
plz help
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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12G
  • 12G
12G
  • 12G
What is the length, in units, of segment CD? 6 8.5 7 9.8
12G
  • 12G
@lvana

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welshfella
  • welshfella
are you familiar with trigonometry?
12G
  • 12G
no this is geometry
welshfella
  • welshfella
oh its easy using trig.. I cant see a way to do it with geometry. Maybe I'm slow today...
12G
  • 12G
how?
12G
  • 12G
@Lexi_Loves
welshfella
  • welshfella
Its easy to find the length of BC by using Pythagoras. BC^2 = 7^2 - 5^2
welshfella
  • welshfella
ah yes use similar triangles triangle ADB and CDA are similar so corresponding sides are in the same ratio.
welshfella
  • welshfella
so 5/7 = 7 / CD solve this for CD
welshfella
  • welshfella
the triangles are similar because
welshfella
  • welshfella
5/7 = 7 / CD therefore CD = 7^2 / 5 = 49/5
welshfella
  • welshfella
use your calculator to work out 49 divided by 5 and you have the answer
welshfella
  • welshfella
* triangles ABC and CDA are similar

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