karolina32 karolina32
  • 15-01-2020
  • Mathematics
contestada

Please I need help..could someone help me?

Please I need helpcould someone help me class=

Respuesta :

josshyaby
josshyaby josshyaby
  • 15-01-2020

Asnswer:

Step-by-step explanation:

Firstly we calculate length of CB

/CA/^2 = /BA/^2 + /CB/^2

12^2 = 6^2 + /CB/^2

144 = 36 + /CB/^2

/CB/^2 = 144 - 36

/CB/^2 = 108

/CB/ = √108

/CB/ = 10.4cm

Sin55 = (/CB/)/(/CD/)

Sin55 = 10.4/(/CD/)

/CD/ = 10.4/sin55

/CD/ = 12.7cm

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