A community for students.
Here's the question you clicked on:
 0 viewing
anonymous
 one year ago
I need help on this, please?
The vertices of a triangle are A(7, 5), B(4, 2), and C(9, 2). What is m?
A. 30°
B. 45°
C. 56.31°
D. 78.69°
anonymous
 one year ago
I need help on this, please? The vertices of a triangle are A(7, 5), B(4, 2), and C(9, 2). What is m? A. 30° B. 45° C. 56.31° D. 78.69°

This Question is Open

misty1212
 one year ago
Best ResponseYou've already chosen the best response.0that is a good question, what is \(m\)? not clear at all since none of the vertices are labelled "m"

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0<ABC?* this was missing in the whole question, sorry

misty1212
 one year ago
Best ResponseYou've already chosen the best response.0here is a nice picture of your triangle i don't see any m in it though http://www.wolframalpha.com/input/?i=triangle+%287%2C+5%29%2C+%284%2C+2%29%2C+%289%2C+2%29

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0yeah, that doesn't help me.. I don't even understand what the question is tell me nor Geometry it self?

misty1212
 one year ago
Best ResponseYou've already chosen the best response.0look carefully at your question you are given the vertices of a triangle, with points labelled A, B, C but then you ask for an angle m there is no m in sight, only A, B, C

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0but thats all it gives me?? hmm?

misty1212
 one year ago
Best ResponseYou've already chosen the best response.0m usually stands for the measure of some angle but that would be "find m<A:for example

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1\[\Large m\angle ABC\] means "angle ABC" where B is the vertex of the angle something like this dw:1436923873975:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Here's the question, maybe this is better?

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1First you use the distance formula to find the distance from A to B. That will give you the length of AB. Do the same for BC and AC

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1tell me what distances you get

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1I don't agree with your last distance of 13

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1you forgot to take the square root of 13

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Square root of 13 is 3.60

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1dw:1436929152566:dw

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1dw:1436929181793:dw

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1a = 5 b = 3.60555 c = 4.24264 use these three values in the law of cosines formula b^2 = a^2 + c^2  2*a*c*cos(B) to solve for the value of B

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0173.8115277? Thats what I got?

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1b^2 = a^2 + c^2  2*a*c*cos(B) 3.60555^2 = 5^2 + 4.24264^2  2*5*4.24264*cos(B) are you able to isolate cos(B) ? If not, try replacing "cos(B)" with "x" ie, solve for x in 3.60555^2 = 5^2 + 4.24264^2  2*5*4.24264*x

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0For 5^2+4.24264^22*5*4.24264*x=42.99999417 then 3.60555^2 =12.9999908 and then I'm stuck, If I'm getting any of this right??

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1`5^2+4.24264^22*5*4.24264*x` will turn into `42.9999941696  42.4264*x`

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.142.9999941696  42.4264*x = 12.9999908025 42.4264*x = 12.9999908025  42.9999941696 42.4264*x = 30.0000033671 x = 30.0000033671/(42.4264) x = ???

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1where are you stuck at?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0all of this.. I get .7071069751?

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1yes x = 0.7071069751

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0oh so I was doing all that right?

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1you agree that 5^2 = 25 3.60555^2 = 12.9999908025 4.24264^2 = 17.9999941696 2*5*4.24264 = 42.4264 right?

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1yeah if you got to x = 0.7071069751, then you are doing it right

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1recall that I replaced "cos(B)" with "x" to make things simpler

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1if x = 0.7071069751 then cos(B) = 0.7071069751

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0oooh theres more work???

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1to find B itself, we apply the arccosine function to both sides cos(B) = 0.7071069751 arccos(cos(B)) = arccos(0.7071069751) B = ???

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1just these last steps and you're done

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0your killing me man, your killing me haha

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1lol what is `arccos(0.7071069751)` equal to ?

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1use a calculator like this one if you don't have a calculator with arccos http://web2.0calc.com/

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1once you click the link, hit enter to have it evaluate

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0round it up its 45. Cool

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1yeah 44.999984287488 > 45

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0awesome, Its correct. Thank you, alot

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1you're welcome

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1I'm glad to be of help

ali2x2
 one year ago
Best ResponseYou've already chosen the best response.0Close the question, But not before you give me a medal :3
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.