[jeof96]

Howdy guys?
So I noticed my grades falling down....
My exams.... FAIL always....
Right now I'm having problems with Geometry...
Lotsa angles, circumference, points, lines, sphere, pyramid..... UGH.....
Can anyone help me, any guide or if you want to teach me here on minegarde, I'll appreciate your help.
Thanks in advance!

[Virtuos]

Stating the specific detail you don't understand much would help.

[jeof96]

Okay...Triangle Congruence and Quadrilaterals...
I don't understand the Postulates.... Including the reasoning....

[Virtuos]

Quote

Postulate 13 (SSS Postulate): If each side of one triangle is congruent to the corresponding side of another triangle, then the triangles are congruent

Side-Side-Side. Simply, If the corresponding sides have equal measure, the triangles are congruent.

Quote

Postulate 14 (SAS Postulate): If two sides and the angle between them in one triangle are congruent to the corresponding parts in another triangle, then the triangles are congruent

Side-Angle-Side.

Lets say the letters correspond to ONE value only. Lets say A has a value of X and a has a value of Y. You can only get X as the value of A if the value of a is Y(since a intersects A). Same goes with the other sides/angles.

For instance, we are given only A, B, and c(wherein c determines the length of C), and the second triangle have the same measures for the corresponding sides/angle. Therefore A₁=A₂, B₁=B₂, c₁=c₂ wherein c determines the length of C. That means the angle will result into the same length of the third side. If we were to go back to postulate 13, the triangles are congruent.

Quote

Postulate 15 (ASA Postulate): If two angles and the side between them in one triangle are congruent to the corresponding parts in another triangle, then the triangles are congruent

Angle-Side-Angle
Two angle measures are given, which means we can find the last angle measure -- 180-(A₁+A₂), since the measure of all interior angles in a triangle is equal to 180. If two are given, we can presume that the corresponding angles with unknown values are equal. Since the angles determines the sides, and with the given situation, three sides are congruent. Postulate 13.

BUT WAIT! What about the side stated?
AFAIK, it tells about the correspondence of sides/angles of a triangle.


ugh. Sorry, this is all what i can pull out of my mind. I'm taking our quarterly exams atm, so i have other subject matter fluttering in my mind. @.@

[jeof96]

thanks for the help. I'm still trying to understand those stuff you posted.
we just finished our exams last week. today should be the examination but our school got the test papers early, so we took it early.
BTW, goodluck on your exams! thanks also!

Anyone?? I still need some help... maybe I'll be online tomorrow....

[HiddenStar]

How old are you guys? I'm trying to figure out if I'm supposed to know this stuff or not x_x

[Halcyon Dtier]

I did the lowest math in High school so can't help you.
We used to call it "Maths in coloring-in"

[jeof96]

judging by my username: "jeof96" I'm 15 actually.....
Right now those are the past lesson I still don't understand, the most easiest for me is the SSS Congruence Postulate...
The others... I don't even understand.....

This post has been edited by jeof96: 26 October 2011 - 01:44 AM

[Tuddle]

circumference is Pi R^2

where pi is the constant 22/7

and R is half of Diameter

This post has been edited by Tuddle: 26 October 2011 - 03:34 AM

[CrossXchaos]

Took Geo when I was a freshmen, I can help with anything except tangents >_>

[HiddenStar]

Well I just got an A* in maths GCSE and I'm 16. I have no clue what the hell you two are on about :/

[Usul]

jeof96, on 26 October 2011 - 09:43 AM, said:

judging by my username: "jeof96" I'm 15 actually.....
Right now those are the past lesson I still don't understand, the most easiest for me is the SSS Congruence Postulate...
The others... I don't even understand.....

What happens when you grow a year older?

[Virtuos]

Done with my exams T_T (physics is a bitch)


this is what i mean by "the angle determines the length of the 3rd side" thingy.

so if you have a different angle measure, it would result into a different length of the 3rd side.

This post has been edited by Virtuos: 27 October 2011 - 05:01 AM

[CrossXchaos]

So... do you have a fixed direction for educational help, or do you just want us to random post math stuff that may be helpful

[jeof96]

Virtuos, on 27 October 2011 - 01:01 PM, said:

Done with my exams T_T (physics is a bitch)


this is what i mean by "the angle determines the length of the 3rd side" thingy.

so if you have a different angle measure, it would result into a different length of the 3rd side.

Ugh..... still can't comprehend....... Please explain more on SAS & ASA.....
So what I learned from those is when , you need to point out what part are they congruent, then SAS ASA SSS are formed.


I'm sharing this for you.... In our 2nd Periodical exams I got 19/40 in mathematics.... Pretty bad huh?
Well, I only excel at Science, second is English.

[Tuddle]

for SAS

if you know two sides and an angle of a triangle, there is only one possible option for the third side. For another triangle that's proportional to the former there is still only one possible option for the third side; and the length of the third side must also be proportional.

like say the sides of a trianle are
3, 4, ?
and the angles are
90, ?, ?

the Pythagorean theorem would tell you the third side is 5

For a triangle that is double the length
6, 8, ?
with the angle
90, ?, ?

the hypotenuse has to be twice the hypotenuse of the former, 10, or else the triangle wouldn't work.


For ASA


The sum of all angles on a triangle is always 180 degrees

so if you knew two angles and a side

say the angles are
30, 60, ??
with the side
1, ?, ?

you would know the missing angle would have to be 90, since 30 + 60 + 90 = 180

So for a triangle that is twice as big with the angles
30, 60, ??
and sides
2, ?, ?

you know the third angles is still 90, because the sum must still be 180.



Forgive me if I'm wrong on this, I'm not a teacher

[Virtuos]

^That

[jeof96]

Tuddle, on 28 October 2011 - 02:34 PM, said:

for SAS

if you know two sides and an angle of a triangle, there is only one possible option for the third side. For another triangle that's proportional to the former there is still only one possible option for the third side; and the length of the third side must also be proportional.

like say the sides of a trianle are
3, 4, ?
and the angles are
90, ?, ?

the Pythagorean theorem would tell you the third side is 5

For a triangle that is double the length
6, 8, ?
with the angle
90, ?, ?

the hypotenuse has to be twice the hypotenuse of the former, 10, or else the triangle wouldn't work.


For ASA


The sum of all angles on a triangle is always 180 degrees

so if you knew two angles and a side

say the angles are
30, 60, ??
with the side
1, ?, ?

you would know the missing angle would have to be 90, since 30 + 60 + 90 = 180

So for a triangle that is twice as big with the angles
30, 60, ??
and sides
2, ?, ?

you know the third angles is still 90, because the sum must still be 180.



Forgive me if I'm wrong on this, I'm not a teacher

Thanks it worked on me, I understand how to get the angles.