A community for students.
Here's the question you clicked on:
 0 viewing
space4cadet101
 2 years ago
I have a Geometry question if anybody can help!! :) thnx!!!
space4cadet101
 2 years ago
I have a Geometry question if anybody can help!! :) thnx!!!

This Question is Closed

space4cadet101
 2 years ago
Best ResponseYou've already chosen the best response.1In triangle DEF, what is the length of DF?

space4cadet101
 2 years ago
Best ResponseYou've already chosen the best response.1here is the question.....i am not really sure how to do it??

terenzreignz
 2 years ago
Best ResponseYou've already chosen the best response.2Well, for starters, DF is the hypotenuse of this right triangle, right? :)

terenzreignz
 2 years ago
Best ResponseYou've already chosen the best response.2Yes... let's redraw this figure, but only including the relevant stuff... dw:1362665968423:dw Now, with respect to the sixty degree angle, what is the side measuring 45?

space4cadet101
 2 years ago
Best ResponseYou've already chosen the best response.1I am not really sure I would think the other angle down below would be 30 degrees if there was one?? I would guess it would be 30 square root of three??

terenzreignz
 2 years ago
Best ResponseYou've already chosen the best response.2Hang on :) Is this side... dw:1362666135050:dw Opposite to the 60 degree angle? Is it adjacent to it?

terenzreignz
 2 years ago
Best ResponseYou've already chosen the best response.2Oh wait, it seems like you already got the answer down...

terenzreignz
 2 years ago
Best ResponseYou've already chosen the best response.2Okay, forget what I said. Do you use sines and cosines already? :D

space4cadet101
 2 years ago
Best ResponseYou've already chosen the best response.1yes I did but can you give me the math part of the equation like how to do it?? I mean I think I know how to do it but I need someone to just write out how they did the equation! if that makes any since??

terenzreignz
 2 years ago
Best ResponseYou've already chosen the best response.2Okay, you want to use sines and cosines, or just the properties of the socalled 306090 triangles?

terenzreignz
 2 years ago
Best ResponseYou've already chosen the best response.2Yes, what? I gave you a choice :P

space4cadet101
 2 years ago
Best ResponseYou've already chosen the best response.1oo sorry I only looked at the last one which is 306090 traingles that is what i wanted

terenzreignz
 2 years ago
Best ResponseYou've already chosen the best response.2LOL OK :) so... suppose we have a 306090 triangle dw:1362666525444:dw

terenzreignz
 2 years ago
Best ResponseYou've already chosen the best response.2Now, if one side measures...dw:1362666670884:dw This is the side opposite the 30degree angle, right?

terenzreignz
 2 years ago
Best ResponseYou've already chosen the best response.2Well, in this case..., the angle opposite the 60degree angle would measure... dw:1362666746027:dw And the hypotenuse would measure

terenzreignz
 2 years ago
Best ResponseYou've already chosen the best response.2dw:1362666784331:dw

space4cadet101
 2 years ago
Best ResponseYou've already chosen the best response.1umm....well I guess 45??

terenzreignz
 2 years ago
Best ResponseYou've already chosen the best response.2What? I didn't ask you anything yet... :P But yeah, you're given the side opposite the 60 degree angle, so that's 45. And this is equal to x sqrt(3) So... \[\large 45=x\sqrt3\] Now solve for x. Actually, solve for 2x, since that's the measure of the hypontenuse.

space4cadet101
 2 years ago
Best ResponseYou've already chosen the best response.1wait this is were I get confused is adding them up!!

terenzreignz
 2 years ago
Best ResponseYou've already chosen the best response.2Okay, slowly... \[45=x\sqrt3\]Now multiply both sides by 2 \[90=2x\sqrt3\]Now divide both sides by sqrt(3) \[\large \frac{90}{\sqrt{3}}=2x\]And rationalise the denominator... \[\large \frac{90\sqrt{3}}{3}=2x\]\[\huge 30\sqrt3=2x\]And so you were right the first time :D

space4cadet101
 2 years ago
Best ResponseYou've already chosen the best response.1okay wow that is really nice of you to write all of that out for me :) thank you so much!! I will give you a medal for all of your help!! thank you :) have a great day!!

terenzreignz
 2 years ago
Best ResponseYou've already chosen the best response.2But make sure you got how to do this... it's really a rewarding feeling, solving one type of problem for the first time on your own... real satisfying :)

space4cadet101
 2 years ago
Best ResponseYou've already chosen the best response.1yeah!! I will write down those steps you gave me and use them in the future!! thank you :)
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.