SPIN: Not The Best At Maths, NEED HELP WITH MY TEST PLEASE

[KyokushinKarateMan]

This SIN/COS/TAN sh*t is beating the brakes off me but I just need help with this one problem please brehs

So I know that angle B is 45deg because 180 rule. Then I was like boom hit em with that pythagorean theorem until I got halfway through and remembered that it only applies to Right triangles, not this goofy looking sh*t below

Tried applying the Laws of Cosines but the hypotenuse isn't known, which is the whole problem in the first place. Then I thought try to use TAN since Idk the hypotenuse but TAN only gives me some dumb sh*t "0.06cm" which can't possibly be the length of the unknown side considering the other two are 4 and 11 cm's

And I've been stuck ever since brehs. HALLLLLLLLLPPPP

 

[O.T.I.S.]

I honestly forgot all this, seeing as to how I never used it outside of a math class

I’m sure there’s a formula for this. But it’s hard trying to do it in my head correctly.

100 or 110 degrees just a guess

 

[KyokushinKarateMan]

100 or 110 degrees just a guess

Thanks breh, but you’re answering for a missing angle not the missing side. All 3 angles are already known(2 of them are already given and the third is 45degs). I need the missing side(the hypotenuse) of the entire triangle itself.

One side is 4.2” another side is 11.4” and the third side is blank

 

[O.T.I.S.]

Thanks breh, but you’re answering for a missing angle not the missing side. All 3 angles are already known(2 of them are already given and the third is 45degs). I need the missing side(the hypotenuse) of the entire triangle itself.

One side is 4.2” another side is 11.4” and the third side is blank

Well is there a set number in degrees that the triangle is supposed to be?

Circle is 360

Half circle is 180

half of that is 90

I just googled and it says all triangles are 180 degrees.

so 120 + 15 is 135 degrees. 180 - 135 should be your answer at 45 unless I’m dumbing this down too much. Side length I’m not sure, there should be a formula. Maybe 12?

No multiple choices I’m assuming

 

[KyokushinKarateMan]

@Krisrunner2049 @KingZimbabwe get your ass in here and be good for something you sonovabicch

 

[KyokushinKarateMan]

Well is there a set number in degrees that the triangle is supposed to be?

Circle is 360

Half circle is 180

half of that is 90

Yes, 180 degrees. The 3 angles of a triangle should always total 180 degrees. That’s how I was able to easily find angle B. Because we already have 120deg and 15deg given for the other two angles. And considering there’s only 180 degrees in a triangle, that only leaves 45deg left for angle B. That part was easy for me. It’s finding the missing side that’s killing me.

 

[O.T.I.S.]

Yes, 180 degrees. The 3 angles of a triangle should always total 180 degrees. That’s how I was able to easily find angle B. Because we already have 120deg and 15deg given for the other two angles. And considering there’s only 180 degrees in a triangle, that only leaves 45deg left for angle B. That part was easy for me. It’s finding the missing side that’s killing me.

Yeah I’m a lil too far removed to remember how to get the side length. Sorry breh


I just know that if the triangle was a regular triangle all side lengths would be the same. That length is longer than the 11.4 which is why I said 12.

 

[KyokushinKarateMan]

Whole Saturday legit about to be ruined over one problem

 

[CopiousX]

This SIN/COS/TAN sh*t is beating the brakes off me but I just need help with this one problem please brehs

So I know that angle B is 45deg because 180 rule. Then I was like boom hit em with that pythagorean theorem until I got halfway through and remembered that it only applies to Right triangles, not this goofy looking sh*t below

Tried applying the Laws of Cosines but the hypotenuse isn't known, which is the whole problem in the first place. Then I thought try to use TAN since Idk the hypotenuse but TAN only gives me some dumb sh*t "0.06cm" which can't possibly be the length of the unknown side considering the other two are 4 and 11 cm's

And I've been stuck ever since brehs. HALLLLLLLLLPPPP

Nah law of cosines still applies. If you rotate the whole triangle 180degrees-15degrees, you'll notice that the hypotenuse is actuallly side with angleB and angle 15deg opposite from it.


There is some indirect reasoning/logic thats applicable here based on inequalities. There is a postulte in Euclidean geometry that states that the length of a side is proportional to the angle opposite it.


As a result...

• We know angle b is 45
• the side directly accross from angle15deg is greater than the side opposite angle B, because of their angle length relations.
• Similarly the side opposite 120 is greater than side opposite angle b
• Finally, the side opposite angle120 is also greater than the side opposite angle 15deg
• Hypotenuse is also longest side, opposite the longest angle, and equal to c

So what does all this mean? This means that hypotenuse is actuallly side with angleB and angle 15deg opposite from it and opposite angle 120deg.


@KyokushinKarateMan , you use law of cosine because you know angle C, in order to find the unknown side c

 

[O.T.I.S.]

Oh I think I get it.

15 + 120 = 11.4

45 + 120 = 4.2

45 + 15 = ____

 

[CopiousX]

Should be

• 13.98 = c
• 45 = B

 

[KyokushinKarateMan]

Nah law of cosines still applies. If you rotate the whole triangle 180degrees-15degrees, you'll notice that the hypotenuse is actuallly side with angleB and angle 15deg opposite from it.


There is some indirect reasoning/logic thats applicable here based on inequalities. There is a postulte in Euclidean geometry that states that the length of a side is proportional to the angle opposite it.


As a result...

• We know angle b is 45
• the side directly accross from angle15deg is greater than the side opposite angle B, because of their angle length relations.
• Similarly the side opposite 120 is greater than side opposite angle b
• Finally, the side opposite angle120 is also greater than the side opposite angle 15deg
• Hypotenuse is also longest side, opposite the longest angle, and equal to c

So what does all this mean? This means that hypotenuse is actuallly side with angleB and angle 15deg opposite from it and opposite angle 120deg.

In this problem the hypotenuse is actually across from the 120deg angle, which is angle C. That makes the hypotenuse “side” c, which is the side directly across from angle C(120), the longest side, which happens to also be blank in this problem

Regarding the rest of the bolded, the side directly across from 15deg angle is side a(4.2”) so it can’t be greater than the side opposite angle B because that side is side b(11.4”). An angle’s corresponding ‘side’ is always directly across from it(the angle). So when you say “the side directly across from angle 15deg” you’re referring to side a which is 4.2”, which we know is less than the side for b which we see is 11.4”. But thank you for helping man I fell asleep yesterday trying to figure this sh*t. Still haven’t gotten it yet and it’s due tomorrow morning smh.

 

[J.E.T.S]

Here’s some math:

Y’all three dumb and two stupid.

 

[KyokushinKarateMan]

Here’s some math:

Y’all three dumb and two stupid.

I’m trying breh

 

[SheWantTheD]

Fam.. like others have said a triangle is a total of 180 degrees. 180 - (120 + 15) = 45 so angle B is 45 degrees.

then you take all that info and use the tan cos cotangent bs to find the Missing length of the triangle.

lemme see what I can find.

Edit: scratch all that sine cosine sh. To find the missing length use Pythagorean’s theorem. The side opposite of the 120 degrees is c as it’s the biggest angle

so 11.4^2 + 4.2^2 = c^2