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Mathematics 7 Online
OpenStudy (anonymous):

Math HW help! @Clalgee help!

OpenStudy (clalgee):

Hi! What can I do for you?

OpenStudy (anonymous):

Give me a second and I will post the question.

OpenStudy (clalgee):

Alright.

OpenStudy (anonymous):

Alright so here we go. BH is perpendicular to AC. Find x the length of BC.

OpenStudy (anonymous):

OpenStudy (clalgee):

Alright, so do you know where to start?

OpenStudy (anonymous):

Negative Sherlock.

OpenStudy (clalgee):

Ok. I will help you start off. BH perpendicular to AC means that triangles ABH and HBC are right triangles, am I right?

OpenStudy (anonymous):

Your right.

OpenStudy (clalgee):

So that means that : tan(39*) = 11 / AH or AH = 11 / tan(39*)

OpenStudy (clalgee):

So now, fill in the blanks. ? = ? - AH = 19 - ? / tan(39*)

OpenStudy (anonymous):

HC I think. 19. and 11?

OpenStudy (clalgee):

Perfect! So now we will set these of to the side for now.

OpenStudy (clalgee):

Pythagora's theorem applied to right triangle HBC: \[11^ 2+HC=X^2\]

OpenStudy (clalgee):

Do you think you can solve for X?

OpenStudy (anonymous):

No.... :(

OpenStudy (clalgee):

Aw, just give it a try. Give it your best go!

OpenStudy (anonymous):

ok

OpenStudy (anonymous):

x = sqrt [ 112 + (19 - 11 / tan(39o) )2 ]

OpenStudy (clalgee):

O.o Wow! You didn't even need my help! great job! What will that give you?

OpenStudy (anonymous):

Haha! But I didn't even know where to start! and I think its 12

OpenStudy (clalgee):

Close! You have to round it by the 3rd number. Now what would your answer be?

OpenStudy (anonymous):

12.3!!

OpenStudy (clalgee):

Yes! NIce job! You did an awesome job!

OpenStudy (anonymous):

Thank yo sooo much! Your a lifesaver!

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