A community for students.
Here's the question you clicked on:
 0 viewing
 one year ago
Solve the triangle. Round lengths to the nearest tenth and angle measures to the nearest degree. a = 7, b = 7, c = 5
 one year ago
Solve the triangle. Round lengths to the nearest tenth and angle measures to the nearest degree. a = 7, b = 7, c = 5

This Question is Closed

britbrat4290
 one year ago
Best ResponseYou've already chosen the best response.0B. A = 69°, B = 69°, C = 42°??

mebs
 one year ago
Best ResponseYou've already chosen the best response.0\[7^{2} = 7^{2} + 5^{2}  2(7)(5)cosA\]

britbrat4290
 one year ago
Best ResponseYou've already chosen the best response.0my answers need to be in degrees

mebs
 one year ago
Best ResponseYou've already chosen the best response.0you get \[cosA = \frac{ 25 }{ 70 }\] than do arc cosine. you get angle 69.07

britbrat4290
 one year ago
Best ResponseYou've already chosen the best response.0i need degrees for a b n c ??

mebs
 one year ago
Best ResponseYou've already chosen the best response.0you get angles 41.8 and 69.07. again

britbrat4290
 one year ago
Best ResponseYou've already chosen the best response.0A. A = 70°, B = 70°, C = 40° B. A = 69°, B = 69°, C = 42° C. A = 42°, B = 69°, C = 69° D. A = 69°, B = 42°, C = 69°

genius12
 one year ago
Best ResponseYou've already chosen the best response.1Note that the triangle is isosceles:dw:1375984026354:dw

britbrat4290
 one year ago
Best ResponseYou've already chosen the best response.0ok ? still confused

genius12
 one year ago
Best ResponseYou've already chosen the best response.1Now use the cosine law:\[\bf a^2=b^2+c^22bc \cos(A) \implies 5^2=7^2+7^22(7)(7)\cos(A)\]Note that 'A' is the angle opposite side BC. Now rearrange and solve for cos(A):\[\bf \implies \cos(A)=\frac{73}{98}=0.7445 \implies \cos^{1}(0.7445)=A=41.884 \ degrees\]

genius12
 one year ago
Best ResponseYou've already chosen the best response.1Now because the triangle is isosceles, the remaining two angles B and C are equal so we can find each of them by subtracting A from 180 and dividing the result by 2:\[\bf \angle B=\angle C=\frac{ 180 41.884}{ 2 }=69.058 degrees\]Rounding off our results to the nearest degree we get:\[\bf \angle A =42 \ degrees\]\[\bf \angle B=\angle C=69 \ degrees\] @britbrat4290

genius12
 one year ago
Best ResponseYou've already chosen the best response.1@britbrat4290 So your answer is correct =]
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.