squishycomeon squishycomeon
  • 25-01-2017
  • Mathematics
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pleaaasse explain:)))

pleaaasse explain class=

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twizzy1002 twizzy1002
  • 25-01-2017
The first one is correct.
DC=AC
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helpmetnx helpmetnx
  • 25-01-2017
Remember alternative interior angles... so angle BDC is 20°  and angle BDA is 30° 

This means that the side lengths are equal

Hope this helps ;)
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