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
ch4aika [34]
3 years ago
8

In ∆DEF, DE = 18, EF = 16, and DF = 12. Find m∠F.

Mathematics
1 answer:
german3 years ago
5 0

Answer:

∠F=78.58484226°

Step-by-step explanation:

a²=b²+c² - 2bc cosA

DE²=EF²+DF² - 2(EF)(DF)cos∠F

18²=16²+12²-2(16)(12)cos∠F

324=256+144-384cos∠F

324-400=-384cos∠F

76=384cos∠F

0.197916=cos∠F

∠F=cos⁻¹(0.197916)

∠F=78.58484226°

You might be interested in
18=3(3x-6) multi step equation
Tems11 [23]

Answer:

x=4

Step-by-step explanation:

18=3(3x-6)

Divide each side by 3

18/3=3/3(3x-6)

6 = 3x-6

Add 6 to each side

6+6 = 3x-6+6

12 = 3x

Divide by 3

12/3 = 3x/3

4 =x

4 0
4 years ago
Read 2 more answers
Please help......................
just olya [345]

Answer:

B

Step-by-step explanation:

6 0
3 years ago
TRUE OR FALSE QUESTION
stira [4]

That's false.  p(x) can have any number of linear factors (one or more).

p(x) = x(x+1)(x+2)(x+3)

has p(-3)=0 and four linear factors.

7 0
4 years ago
What is the simplified form of 1/x-1/y/1/x+1/y?
PIT_PIT [208]

Answer:

b

Step-by-step explanation:

6 0
3 years ago
How can you order a ladder
LuckyWell [14K]
You can either go order one online or a hardware store (like Home Depot and Lowes)
8 0
3 years ago
Read 2 more answers
Other questions:
  • Mrs. Anderson surveyed her class and asked each student, "How many hours do you spend
    14·1 answer
  • Which equation represents the sentence? seven times a number is 9 more than 4 times the number. 7n + 4 = 9 7n + 9 = 4n 7n = 4n +
    12·1 answer
  • What is the sum of the measures of the exterior angles of an equilateral triangle?
    8·1 answer
  • Can someone please explain how you do this. I would really appreciate it.
    8·1 answer
  • I'm really lost on this problem
    7·1 answer
  • Please help<br> Find answer Asap and I will mark as brainliest!!
    13·2 answers
  • Help meee please i give brainly-est just help also no links!
    12·1 answer
  • In ΔMNO, n = 740 cm, m = 690 cm and ∠M=65°. Find all possible values of ∠N, to the nearest degree.
    5·1 answer
  • Population data from three towns is displayed in the tables below. Which town has growth that follows an exponential model?
    12·1 answer
  • What is the ratio of 250 cm to 2 m​
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!