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
nata0808 [166]
3 years ago
11

Find m∠C m . A. 34 B. 57 C. 52 D. 64

Mathematics
1 answer:
lara [203]3 years ago
3 0

Answer:

  B.  57

Step-by-step explanation:

You can solve the triangle using the Law of Cosines, then find the required angle using the Law of Sines. Or, you can estimate it based on the fact that the angle shown is very nearly 90°.

If ∠B were 90°, then the value of ∠C would be ...

  ∠C ≈ arctan(21/14) ≈ arctan(1.5) ≈ 56.3°

Since ∠B is slightly smaller, ∠C will be slightly larger. The nearest value slightly larger than 56.3° is choice B, 57°.

_____

Doing this the long way, you get ...

  b² = a² + c² - 2ac·cos(B) = 14² +21² -2(14)(21)cos(89°) ≈ 626.738

  b ≈ √626.738 ≈ 25.035

Then angle C is given by the law of sines as ...

  sin(C)/c = sin(B)/b

  C = arcsin(c/b·sin(B)) ≈ arcsin(0.838707) ≈ 57.004°

  m∠C ≈ 57°

_____

Many graphing calculators can solve triangles, as can phone or tablet apps.

You might be interested in
Laden bought 10 bags of small marbles and 8 bags of large marbles.There were 12 marbles in each bag.How many Marbles did Karen b
mihalych1998 [28]

Answer:

216 marbles bought altogether

Step-by-step explanation:

small m- 10

large m- 8

10×12+8×12=

120+96

= 216

6 0
3 years ago
Read 2 more answers
How do you explain expanded notation method for 82 times 3
BabaBlast [244]
The answer in expanded form?
4 0
3 years ago
Read 2 more answers
I have 7 hundreds blocks, 5 tens blocks, and 8 ones blocks. I use my blocks to model two 3-digit numbers. What could my two numb
kompoz [17]
Thought about it and theres a couple of others but i'm going to say 424-334
7 0
3 years ago
Will pick brainlyest help me plz 15 pts
leonid [27]
1.50c + 2.50a = 1100
c + a = 500

multiply the second equation by -1.50
                    
                      1.50c + 2.50a = 1100
-1.50c - 1.50a = -7.50


8 0
3 years ago
What is the answer to the problem I am stuck on?
liubo4ka [24]

Answer:

A

Step-by-step explanation:

1*1/4 is One lap, but you want 23 laps so exchange the 1 with a 23:

23*1/4

A

6 0
3 years ago
Read 2 more answers
Other questions:
  • Chloe collected 4 times as many bags of cans as her friend. if her friend collected 1/6 of a bag how much did Chloe collect
    11·1 answer
  • What is the y-intercept of the function f(x) = _2/9×+1/3​
    15·1 answer
  • The line width used for semiconductor manufacturing is assumed to be normally distributed with a mean of 0.5 micrometer and a st
    12·1 answer
  • Two non-simultaneous events have an equal likelihood of occurring (50%). If the events are independent of each other, what is th
    15·2 answers
  • Can someone explain to me how to do this please
    5·1 answer
  • Andres has 18 sour cherry fruit strips. He and 4 of his friends are going to share them all equally. How many fruit strips will
    5·1 answer
  • Use fraction models to solve each
    11·1 answer
  • Please help guys I need to pass my semester final exam!
    8·2 answers
  • HELP PLEASE DUE IN 4 MINUTES
    14·1 answer
  • The number of girls in the Middle School Cyber Club was 6 more than double the number of boys, and in total there were 48 middle
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!