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professor190 [17]
2 years ago
10

The perimeter of a Parallelogram is 72 meters.

Mathematics
1 answer:
Debora [2.8K]2 years ago
3 0

Nice to know how long parallelogram is 72 meters :)

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Use the sum and difference identities to find the exact values of the sine, cosine, and tangent of the angle. . 165 = 135 + 30
Serhud [2]
So lets get to the problem 

<span>165°= 135° +30° </span>

<span>To make it easier I'm going to write the same thing like this </span>
<span>165°= 90° + 45°+30° </span>

<span>Sin165° </span>
<span>= Sin ( 90° + 45°+30° ) </span>
<span>= Cos( 45°+30° )..... (∵ Sin(90 + θ)=cosθ </span>
<span>= Cos45°Cos30° - Sin45°Sin30° </span>

<span>Cos165° </span>
<span>= Cos ( 90° + 45°+30° ) </span>
<span>= -Sin( 45°+30° )..... (∵Cos(90 + θ)=-Sinθ </span>
<span>= Sin45°Cos30° + Cos45°Sin30° </span>


<span>Tan165° </span>
<span>= Tan ( 90° + 45°+30° ) </span>
<span>= -Cot( 45°+30° )..... (∵Cot(90 + θ)=-Tanθ </span>
<span>= -1/tan(45°+30°) </span>
<span>= -[1-tan45°.Tan30°]/[tan45°+Tan30°] </span>

<span>Substitute the above values with the following... These should be memorized </span>
<span>Sin 30° = 1/2 </span>
<span>Cos 30° =[Sqrt(3)]/2 </span>
<span>Tan 30° = 1/[Sqrt(3)] </span>
<span>Sin45°=Cos45°=1/[Sqrt(2)] </span>
<span>Tan 45° = 1</span>
4 0
3 years ago
(It's late cuz no one answered it. Please Solve! I already posted this so don't answer both questions for points.)
earnstyle [38]

Answer: The slope is 80.75.

Step-by-step explanation: You just use the formula for rise over run.

7 0
3 years ago
Jesse is not allowed to work more than 20 hours each week at his part time job . He has already worked 4 hours this week. The in
Drupady [299]

Been a bit since i’ve done this kind of problem.

X+4=20

X is the number of hours needed to work, while 4 is the hours already there.

8 0
3 years ago
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In the figure below, angle X is 35 degrees. What is the measure of angle Z?
ira [324]

Answer:

Z = 45 degrees

Step-by-step explanation:

the angle is still an acute angle but it is not a right angle so it must be 45 according to my calculations. plz mark brainliest

3 0
2 years ago
Which are possible lengths of the sides for a triangle?
icang [17]

Answer:

D

Step-by-step explanation:

im not sure if they can be the same length, but heres the explanation: so a+b is higher than c, (9=a, 7=b, 11=c) but c is the bigger number by itself. so since a+b is higher added together, it makes it a triangle. sorry if this is wrong but i think its right.

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