i need help with a basic trigonometry question?

Question

i've just started taking trig. and it's extremly hard. i don't quite understand the basics either. i want to know how do i calculate the unknown side of a triangle when i have one identified side and an angle.

its a right triangle :/

Answer 1

multiply the tangent of the given angle by the known side as long as it's not the sloping side (i.e. the hypotenuse). You will need a scientific calculator to do this. I am assuming of course that you are dealing with a right triangle. This will give you the other side of the triangle. Example:

lets say you have side A of a right triangle and an angle of 30 degrees and A = 10. Take your scientific calculator press 30 and then the tan button depending on the type of caculator you have. Now multiply that result by 10 and you will get side B.

Side C is found by A^2 + B^2 = C^2. take the square root for your answer.

Now if the given angle is opposite the given side. Just calculate the angle of the given side by adding the given angle to 90 degrees and subtract the result from 180, and then multiply the tangent of the new new angle by the given side.

Theoretically you can check the answer by multiplying the new side by the tangent of the new angle. You should in theory get the given side. But my trig is so rusty I may have forgotten more than you will ever know. good luck.

Answer 2

Trig is very easy, i used to had problems with it too, but now its very easy,,, First you have to identify what kind of triangle you're working with. If it has a 90 degree angle or not.
But I think you cant solve a triangle with just one side and 1 angle you Need at least 2 sides and 1 angle, or 2 angles and 1 side. Something like that...

Answer 3

First you want to entice this image as an instance the problem, extra powerful. That way you'll obviously see that you've a good (90degree)Triangle. With 2 aspects given. This issue is a present to you. Now all you ought to do is observe the pythagorean theorem: Given: 1st. The pole is 28 ft intense. Draw a lengthy vertical line on the left area of your web page. 2d. The cord it rather is stretched from thhe correct of the pole is actually 5 ft remote from the bottom of the 28 foot pole. So in case you stood on the bottom of the 28 foot pole and took 5 paces ahead and seem down thats the position the cord on the right, of the 28 foot pole stretched all a thanks to the floor ought to end! So now your drawing must be structure like an L from the left of the web page with 28 ft the lengthy Vertical! leg of the ninety degree and 5 ft the fast small horizontal leg of the ninety degress. The area we are not! given( Pole cord) is the diagonal area of the right triangle, that connects the right of the 28 foot leg and the right of the fast 5 foot leg. it truly is termed the Hypotneuse. The pythagorean theorem states in case you comprehend 2 legs ANY! 2 legs or aspects of a good(90degree) triangle then you definitely can discover the 0.33 area with the help of apllying this formula: c^2 = a^2 + b^2 the position c = hypotneuse a & b = different aspects of the right triangle( dose not matter which leg is a or b.) so if we take the sq. root of each and every area of the formula( c^2 = a^2 + b^2 ) with a view to eliminate the squared signal of c, we get: c = sqrt( a^2 + b^2 ) now shall we replace 28' = a 5 = b = sqrt( 28^2 + 5^2 ) sqrt( 784 + 25 ) sqrt( 809 ) c = 28.40 4 ft There you've it. the respond to the question " How lengthy is the cord to the nearest 10th?" is : To the nearest 10th 28.4 ft desire this helped

Answer 4

Are you working with right triangles? I can help, but need to know.

If it is a right triangle, then subtract 90 (the right angle) and the angle you know from 180. Now you have the measures for all three angles.

Lable the angles A, B, and C, and lable the sides a, b, and c, with side a being across from angle A, same with b and c.

the law of sines states
sinA/a = sinB/b = sinC/c

so, use side a for your know side, and just set up the equation, using two parts at a time.

Answer 5

the main thing in trig is that it has relation,that is the ratio of two sides is proportional to the angle,this angle is in terms of sine cos tan.so if u know one side and angle then just substitute their relation with angle.
for ex:
a triangle has a=12,b=?,c=?,angle acb=45
then simply use tan45=12/x. let x=b
then x=12/tan45
x=12/1=12.

Answer 6

THat's not enough unless it's a right triangle or isoceles or something. If it's a right triangle, then you need an angle other than the 90 deg one. Then you use SOHCAHTOA.

http://matcmadison.edu/is/as/math/kmirus/Textbooks/804380Text/Trigonometry.html

Answer 7

Just remember this rule:
SOH - CAH - TOA
Which stands for "Sine opposite over hypotenuse, cosine adjacent over hypotenuse, tangent opposite over adjacent."
So the sine of an angle equals the length of the side opposite the angle divided by the length of the hypotenuse. (The hypotenuse is the side opposite the 90 degree angle in the triangle.)

Answer 8

To identify a triangle, you must have 2 sites aand one angle

One side is not enough

Answer 9

You guys are good. And who said that our education system sucks when we have smart folks like you who know trigonometry and geometry? Believe me, you will all be glad you know trig and geometry if you ever have to perform home repairs that involve carpentry and measuring angles.

Answer 10

What kind of triangle is it ?
Id the damn triangle