laurendees2004 laurendees2004
  • 18-10-2018
  • Mathematics
contestada

please help and show working out

please help and show working out class=

Respuesta :

wegnerkolmp2741o
wegnerkolmp2741o wegnerkolmp2741o
  • 18-10-2018

cb^2 + ab^2 = ca^2  pythagorean theorem

cb^2 +6^2 = 12^2

cb^2 +36 = 144

cb^2 = 108

cb = sqrt (108)

sin D = opp /hyp

sin D =bc/cd

sin 55 = sqrt(108)/cd

cd = sqrt(108)/sin 55

cd=12.687

cd = 12.7  to three significant figures

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