geometry
posted by Kaytee .
I am studying for my GRE exam into grad school and it's been a very long time since I've done geometry. I have a problem to which I need to solve for the area of a triangle but I do not have the base. I do have all angles but I cannot remember how to convert angles into their corresponding line segments. Any help on this matter would be greatly appreciated. Thank you.
Kaytee
If you have all the angles, and two sides..you can use the law of sines, or the law of cosines.
Law of sines:
a/SinA = b/SinB = c/sinC
law of cosines:
c^2= a^2 + b^2 2abCosC
The law of sines will be easier.
Thank you but I only have one side (the height) and all 3 angles. Any other solution?
Give us those angles and side and height
Use the law of sines>
a/SinA=b/sinB
You have angles A,B and side a.
Well, thank you for your insight but I was just wondering if there was a simple law that would give me a side from 2 corresponding angles. I was sure that the angles could be added in a certain fashion or something to give me the corresponding side. Unfortunately for this exam we cannot use a calculator so I have to be able to find the answer free hand; and to be honest I have never learned about the law of sines at all. I would appreciate anymore ideas. Here are the angles:
it is a right triangle with the other two angles being 30 degrees and 60 degrees with a height of 5. What I need to know is which is greater, the area of the triangle or 25*the square root of 3. In order for me to find the area though I must be able to find the base. Please help.
Kaytee, the angles you gave us are termed "nice" angles and you're expected to know the sin, cos, and tan values for angles with degree 30,45,and 60. I'll let you look up their values, but in trig we're expected to learn these ones by rote. You should see easily why they're "nice".
You might want to start a new post so we can see it; looks like this one's getting ready to go over the edge.
Respond to this Question
Similar Questions

Geometry Proofs, HELP!!
I need help, I have a Geometry Exam on Monday. And I don't understand proofs one bit. If someone could help me with some proofs that would be awesome!! You have to post specific questions to get specific help. My experience is that … 
Studing for French Final
I have been studing for the past four days except I think I need some better ways to studying for my french final. I am in French 1 and we are doing auditory exams tomorrow and then oral on tues. and the written exam on Wednesday. … 
Gen
i need help or suggestions answering these please.. Identify what information should be gathered to help in solving it and where this information may be obtained. · Describe the process to evaluate the gathered information, such as … 
Math : Geometry : Similar triangles
two right triangles are similar. the of the larger triangle is 4 times as long as the base of the smaller triangle. the height of the longer triangle is 16cm. the area of the smaller triangle is 6cm^2. What is the area of the long … 
math geometry help
learning geometry i need to determine whether each pair of figures is similar. and explain why or why not: since I cant draw can you help me with this pls im so lost. 1) triangle xyz <x 65 degrees <y is 65 <z is 50 line xy … 
Math 7  NYS Math Exam Review  Book 1 (HW)
C = 2nr!?!??!??! Since the NYS Math Exam is coming up (in my district in my school we have it next week). You see in my class were not done with our geometry and ratio, proportion unit and plus we are missing one unit: algebra. We 
MAth
How i change 315 grad in 7xpi/4? I have on Thuesday a exam in math but i don't no how i can convert 135 grad in in this form(how the example above). I need it for complex Numbers 
TrigGeometry  Law of sines and cosines
Hello everyone, I've been struggling on this problem for quite some time. It would be appreciated if you could help. Thanks. (The website is the diagram, it is a screenshot) In the diagram below, triangle ABC has been reflected over … 
Geometry
Hi I was having some problem with this question, its been a while since I had been in geometry. I think you foil, but Im not sure. Solve for X. 2(x+4)(x+3)= 3(x+2)(x1) 
English
4. Complete the sentences. My answers are with capital 1. ………comfortable standing on stage. 1. Have never been feeling 2. Have ever felt 3. Has never feeling 4. HAVE NEVER FELT 2. The last time I …..in front of a large audience …