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anonymous
 one year ago
Find the measure of angle A in the following triangle
https://static.k12.com/eli/bb/259/4_25245/2_17293_3_25248/8b7911af6ff4046b03fa260fbecdad8100849773/media/24e8a3fc18d4d615b2db04a4683bba3137e4a8b0/mediaasset_774319_1.gif
45.6 degrees
54.5 degrees
40.5 degrees
41.2 degrees
anonymous
 one year ago
Find the measure of angle A in the following triangle https://static.k12.com/eli/bb/259/4_25245/2_17293_3_25248/8b7911af6ff4046b03fa260fbecdad8100849773/media/24e8a3fc18d4d615b2db04a4683bba3137e4a8b0/mediaasset_774319_1.gif 45.6 degrees 54.5 degrees 40.5 degrees 41.2 degrees

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Nnesha
 one year ago
Best ResponseYou've already chosen the best response.2you need to use the *law of cosines * formula \[\huge\rm a^2 =c^2+b^2 2bc \cos(A)\]

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.2a is the opposite side of angle a dw:1438384855308:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0thanks alot! @Nnesha

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0So would the answer be 41.2? @Nnesha

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.2show your work plz so i can see where you did the mistake

anonymous
 one year ago
Best ResponseYou've already chosen the best response.014^2=196=20^2+10^2=400+100+5002x10x20cos

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.2oaky so how did you get 500 ?

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.2ohh i guess there suppose to be equal sign gotcha

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.2so you have 196=500400cos(A) 2 times 10 times 20=^^400

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.2\[\huge\rm 196=500400\cos(A)\]

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.2no no no no!!!! \(\huge\color{RED}{\rm NO!!}\)

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.2okay let cosA =x so 196=500400x can you subtract 500 from 400x ?

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.2yes so you can't subtract 500 from 400cos(A) but you need to subtract 500 both sides

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0304 and 500 cancels out

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.2yep \[\huge\rm 304=400\cos(A)\] now whats next ?

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.2400 is multiplying with cos(A) so to cancel out 400 from right side do opposite of multiplication thats mean divide both side by 400

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.2yes so now \[\huge\rm cos(A) = .76\] you need to take inverse of cos \[\huge\rm A=\cos^{1} .76\] use calculator for inverse cos let me know what you get

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I only have my phone as a calculator and it dosent have cosine or sin or tan on it

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.2can you use google calculator ?

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.2https://www.google.com/webhp?sourceid=chromeinstant&ion=1&espv=2&ie=UTF8#q=google%20calculator

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.2hmm no first of all calculator should be on degree and use invs cos

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.2wait let me take a screenshot

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.2okay first step) hit the rad button 2nd) click on inv 3r)D click on cos then write .76
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