3 years ago

Could someone help me please ?

Mathematics

1 answer:

jeyben [28]3 years ago

5 0

Answer: 12.66

Step-by-step explanation:

Use pytagoras to find CB

AB= 6 cm

CA=12 cm

CB²=CA²-AB²

CB²=12²-6²

CB²=144-36

CB=√108

CB=6√3

Using formula for sinα=CB/CD

α=55°

sin55°=6√3/CD

CD=6√3/sin55°

CD= 6*1.73/0.82=10.38/0.82=12.66

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