29levelupchaye2
29levelupchaye2 29levelupchaye2
  • 13-01-2018
  • Mathematics
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geometry help? AC=16, CD=5 Find BC

geometry help AC16 CD5 Find BC class=

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tynollette tynollette
  • 13-01-2018
AD=AC-DC=16-5=11
BD=√DC*DA=√5*11=√55
BC²=CD²+BD²=5²+55=80
BC=√80=4√5

another way to do it: BC:AC=CD:CB, CB²=AC*CD=16*5=80, CB=√80=4√5
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