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is this correct? mathswatch won't give me full marks though i am sure it is?

Is This Correct Mathswatch Wont Give Me Full Marks Though I Am Sure It Is class=

Sagot :

sqdancefan

9514 1404 393

Answer:

  AD = 37.77 m

Step-by-step explanation:

Your premise is incorrect. Angle ECD is about 42.88°, found using the law of cosines.

  ∠ECD = arccos((EC²+DC²-ED²)/(2·EC·DC))

  ∠ECD = arccos(765/1044) ≈42.88°

The rest of the work is correct:

  AC = AB×sin(81°)/sin(42.88°) ≈ 66.77 m

  AD = AC - DC = 66.77 m - 29 m

  AD ≈ 37.77 m

View image sqdancefan
View image sqdancefan
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