1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Pavlova-9 [17]
3 years ago
12

If triangle abc, a=3, b=5 and c=7. Find the measure of angle b

Mathematics
2 answers:
Ray Of Light [21]3 years ago
7 0

Answer:

b = 38.22

Step-by-step explanation:

In the given triangle ABC, a = 3, b = 5 and c = 7 is given.

We have to find the measure of angle b.

To get the measure of any angle we will apply cosine rule in the triangle.

b² = a² + c² - 2ac(cosb)

5² = 3² + 7² - 2×3×7×cosb

25 = 9 + 49 - 42×cosb

25 = 58 - 42cosb

-42cosb = 25 - 58 = -33

cosb = \frac{33}{42}

cosb = 0.7856

b= cos^{-1}(0.7856)

b = 38.22

b = 38.22 is the correct answer.

krek1111 [17]3 years ago
4 0

Answer:

β = arccos((a^2 + c^2 - b^2)/(2·a·c))

β = arccos((3^2 + 7^2 - 5^2)/(2·3·7)) = 38.21°

You might be interested in
What do we call moving a record back and forth in a rhythm?
andrezito [222]
The answer is C.Scratching because when doing so it scratched the recorded up
3 0
2 years ago
The odd- and even - number hotel rooms are on different sides of the hall. Room 231 is between witch two rooms
mario62 [17]
The first odd number before 231 which would be on the same side of the hall is 229. The first odd number after would be 233.
On the odd side of the hall, the order would be room 229, room 231, room 233.
8 0
3 years ago
What does combining like terms refers to?
wolverine [178]
Combining like terms refers to adding all of the terms that have a exponent or a variable in an expression.

Example: 6y + 10y - 2

You would combine the like terms, which two numbers have a variable.

6y + 10y = 16y

After combing the like terms, the new expression should be:

16y - 2
7 0
3 years ago
Laticia randomly selected 25% of the seventh grade students in her school and asked them their favorite season. Of the students
Marysya12 [62]
I would say 75 or 150
 Do u know how many students are in her school?
4 0
3 years ago
Question 2 of 5
jeyben [28]

Answer:

27

Step-by-step explanation:

Given expression :  

    1 + 24 + ( + 3) = 1

Bring the number 1 to the left side of the equal sign. The positive 1 becomes negative 1 when brought towards the left side of the equal sign.

1 + 24 + ( + 3) - 1 = 0

Now, opening the bracket, we get

1 + 24  + 3 - 1 = 0

Negative 1 and positive 1 will get cancel

24  + 3  = 0

or 27

Therefore, the value of the numerical expression  1 + 24 + ( + 3) = 1 is 27.

8 0
3 years ago
Other questions:
  • Before agreeing to purchase a large order of polyethylene sheaths for a particular type of high-pressure oil-filled submarine po
    10·1 answer
  • a A teacher had 56 red pens. if the ratio of red pens to blue pens she owned was 7:5 how many pens did she have total
    9·1 answer
  • It asks to "Solve the triangle then find the area of each triangle to the nearest tenth." I know how to find the sides and all b
    14·1 answer
  • When you are given two angle measures and the length of the included side, do you get a unique triangle
    7·1 answer
  • Please help needed!!! Help me!!!
    11·1 answer
  • Find the y-intercept of each line defined below and compare their values
    7·1 answer
  • Cot^2(alpha)csc(alpha)+2cot(alpha)csc(alpha)-3csc(alpha)
    9·1 answer
  • Question 1
    15·1 answer
  • I need serious help!!
    10·1 answer
  • What is the squareroot of 144​
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!