Answered

For all your questions, big or small, IDNLearn.com has the answers you need. Find the answers you need quickly and accurately with help from our knowledgeable and dedicated community members.

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 :

Sqdancefanidn

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
Thank you for participating in our discussion. We value every contribution. Keep sharing knowledge and helping others find the answers they need. Let's create a dynamic and informative learning environment together. IDNLearn.com has the solutions to your questions. Thanks for stopping by, and see you next time for more reliable information.