Major props to anyone who can solve this

[makdaddy]

Re: Major props to anyone who can solve this

lolz

[perkeyone]

Re: Major props to anyone who can solve this

The degree is 15

um no

[madmatt621]

Re: Major props to anyone who can solve this

Do I need to solve it with Paint or can I solve it on graph paper on my desk then take a picture of it?

[MRichards]

Re: Major props to anyone who can solve this

Perhaps these similar triangles are what you're after - simpler and provable without a calculator, though I still used a fair bit of working to prove the side ratios (omitted, tell me if you really want to see it).

There is also a very nice method of dividing the triangle into 3 similar regular trapezoids, but it also gets ugly at the end.

I suspect there might be a further little trick involved to reduce the working - the kind that gets mathematicians all wet around the cosines... Frankly, I still quite like my first sledgehammer approach.



perkeyone: I use Microsoft Visio for the drawings

[perkeyone]

Re: Major props to anyone who can solve this

hey there are 1001 ways to solve this thing so why dont u let us know what way u did it, i am curious to know

[Doug31]

Re: Major props to anyone who can solve this

Here's what I came up with:

[perkeyone]

Re: Major props to anyone who can solve this

Here's what I came up with:

umm how

[MRichards]

Re: Major props to anyone who can solve this

Here's my full working. Involves some trig, but with no evaluation - so it's utterly rigorous. There may be a cheeky way to show it more simply, but this'll do.

[All_That_Chaz]

Re: Major props to anyone who can solve this

o.o;; it's been more than 4 years since I've taken math, more than 6 since I've used geometry... but mrichard's and doug's look right.

...i was considered smart once.

[MrRubix]

Re: Major props to anyone who can solve this

Perhaps these similar triangles are what you're after - simpler and provable without a calculator, though I still used a fair bit of working to prove the side ratios (omitted, tell me if you really want to see it).

There is also a very nice method of dividing the triangle into 3 similar regular trapezoids, but it also gets ugly at the end.

I suspect there might be a further little trick involved to reduce the working - the kind that gets mathematicians all wet around the cosines... Frankly, I still quite like my first sledgehammer approach.



perkeyone: I use Microsoft Visio for the drawings

VERY nice

[MRichards]

Re: Major props to anyone who can solve this

What is the method that requires no trig?

[windsurfer-sp]

Re: Major props to anyone who can solve this

MRichards seems to be FFR's numbers man. I remember his awsome speed mod FFR to Stepmania comparison. I guess Mrubix is numbertacluar as well.

My high school education understands this sort of but I cant do it on my own or from scratch.