Jenna131
Jenna131
17-04-2017
Mathematics
contestada
Please help!!!!!!!!!!
Respuesta :
hanvoldj
hanvoldj
17-04-2017
find the length of AB
AB²=20²+15²
AB²=400+225
AB²=625
AB=25
then find AD and BD
20²=AD·25
400=AD·25
AD=16
15²=BD·25
225=BD·25
BD=9
now use the geometric mean theorem (name?) to find CD
CD=√(9·16)
CD=√144
CD=12 cm
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