A community for students.
Here's the question you clicked on:
 0 viewing
anonymous
 4 years ago
A triangular metal frame has sides 8 feet, 12 feet, and 16 feet. Find the measure of the largest angle between any two sides of the frame.
The cosine of the largest angle=?
anonymous
 4 years ago
A triangular metal frame has sides 8 feet, 12 feet, and 16 feet. Find the measure of the largest angle between any two sides of the frame. The cosine of the largest angle=?

This Question is Closed

sasogeek
 4 years ago
Best ResponseYou've already chosen the best response.1do you know the cosine rule?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Can you tell me it again? I forgot it

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0adjacent over hypotenuse

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Thanks @Nickv_1 So @sasogeek I just use that?

sasogeek
 4 years ago
Best ResponseYou've already chosen the best response.1we're not exactly sure if it's a right angled triangle, so we can't also conclude that it's adjacent over hypotenuse.... where is the adjacent, and where is the hypotenuse?

sasogeek
 4 years ago
Best ResponseYou've already chosen the best response.1see, the cosine rule says that if you have a triangle, dw:1344729963224:dw \(\huge cosA=\frac{b^2+c^2a^2}{2bc} \) we can substitute the values and solve for A (each angle) and see which one is the largest :) then we can find the cosine of that largest angle :)

sasogeek
 4 years ago
Best ResponseYou've already chosen the best response.1let's say for example using this triangle, dw:1344730155989:dw \(\huge cosA=\frac{16^2+8^212^2}{2(16*8)} \) we can solve for A by taking the cos inverse of the value on the right side of the equation.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0"on the right side of the equation"?

sasogeek
 4 years ago
Best ResponseYou've already chosen the best response.1yeah, every equation has 2 sides :) left side = right side     \(cosA \ \ \ \ = \frac{16^2+8^212^2}{2(16*8)} \)

sasogeek
 4 years ago
Best ResponseYou've already chosen the best response.1so to find A, we find the cos inverse of the right side, like this... \(\huge A = cos^{1}(\frac{16^2+8^212^2}{2(16*8)}) \)

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0I'm trying to solve. Just a sec

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0I keep getting error when trying to solve using my TI83

sasogeek
 4 years ago
Best ResponseYou've already chosen the best response.1hmm, let's see what i get..just a sec

sasogeek
 4 years ago
Best ResponseYou've already chosen the best response.1angle A = 79.193 degrees :)

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Thank you! So the final answer is 79.193?

sasogeek
 4 years ago
Best ResponseYou've already chosen the best response.1no, you'll have to check the other angles to be sure which one is the largest :)

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Oh o.k. So I use the same formula?

sasogeek
 4 years ago
Best ResponseYou've already chosen the best response.1yeah :) i'll do it and tell you what i got, in the mean time, do it yourself and let me know what you got too :)

sasogeek
 4 years ago
Best ResponseYou've already chosen the best response.1sorry i made a mistake somewhere, A=46.567 B=104.478 C=28.955

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Oh :/ Was it the formula or a mistake in the arithmetic?

sasogeek
 4 years ago
Best ResponseYou've already chosen the best response.1i just miscalculated, the formula is correct though, the last answers i put up are right... did u get the same thing?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Yes, I used the formula :) So obviously B is the largest angle

sasogeek
 4 years ago
Best ResponseYou've already chosen the best response.1:) so u got the largest angle, what are u supposed to do with it?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Take cosine. So just a sec... .2500?

sasogeek
 4 years ago
Best ResponseYou've already chosen the best response.1yay! :) our work is done here :)

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0And I couldn't have done it without you! Thank you so much I really appreciate it :)

sasogeek
 4 years ago
Best ResponseYou've already chosen the best response.1anytime :) you're welcome :)
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.