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
mafiozo [28]
3 years ago
12

Why are the sime and cosine values of an acute angle in a right triangle always less than 1?

Mathematics
1 answer:
ludmilkaskok [199]3 years ago
7 0
Sine and cosine values are derived from the unit circle, which is a circle with a radius of 1, where the midpoint of the circle is at (0, 0) of the y and x-axis.

Draw a horizontal line from the midpoint (0, 0) to (1, 0) on the x-axis, and that shall be your initial line when the angle equals to 0°.

The terminal line is the line which stretches from (0, 0) to any point on the circumference of the circle.

The angle between the initial line and the terminal line will only be acute if the terminal line is in the position region, where x and y values are positive. This is called the first quadrant of the unit circle.

Recall the basic formula for Sine and Cosine:
SOH CAH, and let x be an angle in a right-angled triangle.
sin(x) = (the side Opposite the angle) / (Hypotenuse of triangle)
cos(x) = (the side Adjacent to the angle) / (Hypotenuse of the triangle)

Back to the unit circle, if you were to draw a line from the tip of the terminal line (the tip touches the circumference of circle) to the initial line, where it meets the initial line perpendically, you'll see a right-angled triangle.

sine of this angle between the terminal line and the initial line will then be:
sin(x) = (the side Opposite the angle) / (Hypotenuse)

{Since the circle is a unit circle, where radius is equals to 1, and since the hypotenuse of the right-angled triangle is the terminal line and is also the radius of the circle, the hypotenuse equals to 1}
sin(x) = (Opposite) / 1
= Opposite
Thus, sin(x) is actually the y-value of the tip of terminal line (the tip touches the circumference of the unit circle). When the angle between terminal and initial lines is 90°, the tip of the terminal line will touch the circumference of the unit circle at (0, 1), which is the highest point of the unit circle. Since the highest y-value of the unit circle is 1 when the angle is 90°, if the angle is an acute angle (I.e. an angle less than 90°), the y-value of the tip of terminal line will always be less than 1.

To simplify it:
When angle x is 0° < x < 90°, sin(x) = Opposite = y-value which is < 1

For cos(x),
cos(x) = (Adjacent) / (Hypotenuse)

Similarly, the hypotenuse is equal to the length of the terminal line, and also equals to the radius of the unit circle (I.e. 1).
cos(x) = (Adjacent) / 1
= Adjacent
The adjacent side of the right-angled triangle is the x-value of the unit circle. The length of adjacent side is from (0, 0) to the perpendicular line drawn from the terminal line down to the initial line.

So, when the angle is equals to 0°, cos(0°) = 1, which is the length of the initial line from (0, 0) to (1, 0). If the angle is an acute angle, the length of initial line or adjacent side will be less than 1.

To simplify:
When angle x is 0° < x < 90°, cos(x) = Adjacent = x-value, which is < 1

Hope this helps! :) I understand that this is a little lengthy as compared to most answers on Brainly, and that this may be complicated or confusing to whoever who reads it the first time, so feel free to ask me more questions to clarify your doubts if you have :)
You might be interested in
Please helppp! I'll give brailiest
OLga [1]

Answer:

range of given function is -5/3,-1,4/3

6 0
2 years ago
Find the sum of \sqrt{4}√ ​4 ​ ​​ and 3\sqrt{9}3√ ​9 ​ ​​ in simplest form. also, determine whether the result is rational or ir
igomit [66]
√​4 + <span>3√​9 = 2+3*3  = 11.

This is a rational number, since the answer can be express as a fraction (e.g., 11/1).

This does not hold for square roots in general. For example </span>√3 is irrational.
5 0
3 years ago
the price of silver has increased by 15% per year from 2000. in the year 2000, harry bought a silver bowl for $190. which of the
lesya [120]
<h2>Answer</h2>

f(x) = 190(1.15)x

<h2>Explanation</h2>

To solve this, we are going to use the standard exponential function:

f(x)=a(1+b)^x

Where

f(x) is the final price after x years

a is the initial price

b is the rate in decimal form

x is the time in years

We know from our problem that the initial price is $190, so a=190. Now to convert the rate, 15%, to decimal form, we are going to divide it by 100%, so r=\frac{15}{100} =0.15. Let's replace the values:

f(x)=a(1+b)^x

f(x)=190(1+0.15)^x

f(x)=190(1.15)^x

8 0
3 years ago
A line has a slope of -6 and passes through the point (2, 3). What is its equation in
Evgen [1.6K]

\bf (\stackrel{x_1}{2}~,~\stackrel{y_1}{3})~\hspace{10em} \stackrel{slope}{m}\implies -6 \\\\\\ \begin{array}{|c|ll} \cline{1-1} \textit{point-slope form}\\ \cline{1-1} \\ y-y_1=m(x-x_1) \\\\ \cline{1-1} \end{array}\implies y-\stackrel{y_1}{3}=\stackrel{m}{-6}(x-\stackrel{x_1}{2}) \\\\\\ y-3=-6x+12\implies y=-6x+15

3 0
3 years ago
Select the correct answer from each drop-down menu.
ivanzaharov [21]

The <em><u>correct answers</u></em> are:

Not change; not change; and triple.

Explanation:

A change in the amount he pays on other ingredients will not change the amount he pays for potatoes.  This means m does not change.

A change in the price of potatoes will not change the amount he pays for the other ingredients.  This means b does not change.

A change in the price of potatoes will, however, change the amount he pays total for the potatoes.  Tripling the price of potatoes will cause the amount he pays total for the potatoes to triple as well.

3 0
2 years ago
Other questions:
  • Describe the possible values for x and y when ∣x − y ∣ &gt; 0. What does it mean when ∣x − y ∣ = 0? Can ∣x − y ∣ &lt; 0? Explain
    14·1 answer
  • The figure shows a carpeted room. How many square feet of the room are carpeted?
    13·2 answers
  • I neeed help thanksssss
    12·2 answers
  • Brianna wants to save the $250 she earned by babysitting over the summer. She's trying to decide which
    5·1 answer
  • A box of chocolates contains milk chocolates and dark chocolates in the ratio 4:3
    13·2 answers
  • Please help i'm stuck on geometry
    12·1 answer
  • You buy 8 rose bushes and 15 daylilies for $193. Your friend buys 3 rose bushes and 15 daylilies for $117. Find the cost of each
    13·1 answer
  • Logan is going to invest $61,000 and leave it in an account for 20 years. Assuming
    15·2 answers
  • 2² + 2[2(3+1)(3-2)-1]
    14·1 answer
  • Question 14 of 16
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!