math question. [again] =P?

Question

I dont know how to constuct an anlge out of lines and segments.
I just dont.
Its the kind where you have to use your compass to make it congruent to the example.

I also dont know how to find the missing measurement of a triangle.

Everything else I get.

Algebra 2 sucks.

At least this section did.

Helpp

Answer 1

Bad news. I can't really help you w/o seeing what you're talking about.

Good news. I wasn't what you'd call "good" at constructions in geometry either, but I wound up county Calculus champion in high school. So don't beat yourself up. Geometry and trig are difficult subject for the really objective-minded mathematician.

and always

SOHCAHTOA

Answer 2

Finding the missing measurement of an angle in a triangle is easy. Just remember that there are always a total of 180 degrees in the measure of all three angles. Then, if you are given the measure of two sides, you can find the measure of the missing angle by simply subtracting the sum of the two given angles from 180.

Sometimes it is possible to the find the measure of an angle even when no angular angles are given whatsoever. Suppose you had a problem in which it is stated that A = 3x, B = 4x and C = 5x, where A, B and C are the measures of angles. The sum of these angles is:

3x + 4x + 5x = 12x

Recalling the sum of the angles of a triangle equals 180 degrees, then we can set 12x = 180 and solve for x.

12x = 180
x = 180/12 = 15.

So, A = 3(15) = 45, B = 4(15) = 60 and C = 5(15) = 75.

As a check, simply add them up and see whether their sum is 180. If it is, you have the right solution, assuming you interpreted the question properly.

Here is a website that might be able to explain how to construct congruent angles and line segments better than I can:

http://www.etap.org/demo/geometry_lesson2/instruction1tutor.html

I'm sure there are others. Just do a search on 'duplicating angles and segments' or 'copying angles and segments.'

Answer 3

on the traingle thing use pathagriams theorm which is " a squared + b squared = c squared " with a, b, being the two shorter sides and c being the hypotenus.

If you want an angle and you have 2 angles aready you just add the 2 angles you already have and subtract that number from 180.


If you want an angle and it is a right triangle (one angle is 90 degree) and you know 2 side lengths you use sin, cosine and tan.
this is where it becomes hard to explain.
sine(q) = opp/hyp
cosine(q) = adj/hyp
tangent(q) = opp/adj
so what you do is you figure out what angle you want to solve for and you look at what side lengths you have, depending on what 2 sides you have then you use one of these three formulas. Then use your scientific calculator and press second (this gives you the angle as apposed to giving you the fraction, or porportion of that angle, and the key sine, cosine, or tangent and put in the correct side lengths in the place of opp, hyp, adj in the equations above. press enter or = and you got the angle mesure.

The reson this works is that if you have a right traingle no matter the size the sides will always have the proportion based on the angle of the other 2 sides. so you can either figure out side by using an angle and a side to figure out other side or 2 sides to figure out the angle.

Here is a link to a page that talks about this and is less confusing
http://library.thinkquest.org/20991/alg2/trig.html?tqskip1=1