[zedman3d]

I did it. And its a very easy question, just wanted to see if you guys could get it. Not that im trying to say anything... lol. Check it with my answer when your done.

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Answer (highlight to view): 129
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[lancec2c30]

Imma gonna guess its D

[Jorsoft]

Guessing D. It's been a while since trig, though.

[zedman3d]

No trig needed. And i posted the answer so you can check if your right... lol.

[lancec2c30]

ppsshhh. I know there was a simple formula I needed to use. But I couldn't remember what it was.

[Jorsoft]

Me either lol. Oh well...the way she goes...

[Tool462]

can u explain how you got 129?

[Apokalipse]

Solution - highlight to read:
360 / 5 = 72 (the middle lines make 5 even sections, with the angles totalling 360º)
30 + 72 = 102 (adding up the two known angles inside the diamond)
360 - 102 = 258 (a four sided shape has a total of 360º when you add up the internal angles)
258 / 2 = 129 (the two remaining angles are the same)

[zedman3d]

^ Exactly. I was so proud when i figured it out. lol.

[Spit-wad]

You can find out that the middle angles are 72 degrees each because they have to total 360, 5 angles = 72 each.

It's a 4 sided shape, so the angles will add up to 360. 360-30-72 = 258
The other 2 angles are similar, so equal. 258/2 = 129

No trig required, just geometry.