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
Tanya [424]
4 years ago
15

PLEASE HELP!! WILL AWARD BRAINLIST TO WHOEVER HAS ALL THE CORRECT CALCULATIONS!

Mathematics
2 answers:
Gekata [30.6K]4 years ago
8 0

Law of cosine:

c² = a² +b² -2ab*cosC.

Because the triangle is equilateral a=b=c=x,

and we can write,

x²=x² +x² -2xx*cosC

x² =2x² -2x²* cos C

-x² = -2x²*cos C

cos C= 1/2,

so m∠C=60⁰.

Because all sides are equal, and across of the equal sides should be equal angles, all angles will be also equal and = 60⁰.

adoni [48]4 years ago
7 0

Using the law of cosines, set up the equation and solve:

s^2 = s^2 + s^2 - 2 (s) (s) (cos x)

s^2 = 2s^2 - 2s^2 cos x

-s^2 = - 2s^2 cos x

0.5 = cos x

60 = x

This shows that all angles in an equilateral triangle must equal 60 degrees.

<em>Hope this helps!</em>

You might be interested in
Simon swapped of 2/5<br>his 40 marbles for 9 of<br>Saqib's. How many has<br>Simon got now?​
valkas [14]

Answer:

33

Step-by-step explanation:

2/5x40=16

40-16=24

24+9=33

7 0
3 years ago
Read 2 more answers
In the figure above circles with centre o and o' are externally tangent at P. I f OA= 5 is a tangent to circle centre o', the ar
olga55 [171]

Answer:

give me points pls

Step-by-step explanation:

7 0
4 years ago
Draw a parallelogram with a 10-cm side, a 6-cm side, and a 60° angle between the sides
BigorU [14]

Answer:

So, you probably want to get a ruler to make sure there a 10-cm side and a 6-cm side. You will also need a protractor to make an exact 60-degree angle between the sides.

Step-by-step explanation:

It should look something like this.

Note: this parallelogram is not drawn to scale. In other words, this parallelogram does not have the exact angles and side measure. (It just an example)

5 0
3 years ago
If you have 1 1/2 gallons of soup how many 1 cup servings can you make?
irinina [24]
1 ½ gallons is equal to 24 cups. 
So your answer is 24 cups can be served with 1 ½ gallons of soup.
7 0
4 years ago
Read 2 more answers
Describe how to sketch the graph of y=2sec(x)-3 using its reciprocal function
blagie [28]
The reciprocal function referred here is the inverse trigonometric function identities. The inverse or reciprocal function of sec x is 1/cos x. Replacing secant with cosine, the equation becomes:

y = (2/cos x) - 3

To graph this, assign random values of x, then you'll get corresponding values of y. Plot the points and connect them together. The graph is shown in the attached picture.

3 0
3 years ago
Read 2 more answers
Other questions:
  • If ABC = ADC, which is NOT true by CPCTC ?
    6·1 answer
  • Find three consecutive integers such that the sum of the first and third is 22.
    13·1 answer
  • Help me on number problem 4 please
    12·1 answer
  • Molly had 6 or 33% robins in her yard. Does she need to find a percent, part or whole
    15·1 answer
  • Select the three situations that model a sum of zero.<br>Explain your answer. ​
    12·1 answer
  • What is the volume of the cone? Use 3.14 for p.
    11·1 answer
  • The 1991 Tractor has a horse power of 195, which is five less than four times the horsepower of the Cinderella's carriage. What
    11·1 answer
  • Reduce to simplest form<br> 3/2 + ( -6/5 ) = ?
    8·2 answers
  • A friend asked Lara to help her divide 456.3 by 100. What should Lara tell her?
    11·2 answers
  • The height of an equilateral triangle is the square root of 12. Find the perimeter of the triangle.​
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!