Why are these angles equal?

>>84737
Because the triangles are similar.

>>84741
Yeah but why?

>>84753
how old are you

>>84755
16

(USER WAS BANNED FOR THIS POST)

>>84758
http://www.4chan.org/rules

Read the 2nd global rule.

>>84760
Oh sorry typo I'm 18

>>84763
Of course you aren't. Triangle similarity isn't taught that late.

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>>84737
x+y+α = 180 degrees
op, review the triangle theorems you have in your textbook and memorize them

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>mods don't even ban this underage shit

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>>84763
Here, because I feel bad for you. This is basic shit senpai, get it together.

>>84758
>>(USER WAS BANNED FOR THIS POST)
Glorious

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>>84758
HOLY SHIT! FUCK YEEEES!!!
THANKS BASED MODS!

>>84758
MODS=GODS

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Praise Jesus.

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>>84758
rekt

>/thread

>>84758
based mods

>>84773
No, that's begging the question.

You only know the other angle is y because you're told the first angle is a.

If there were right-angle marks anywhere then you'd be right, but there aren't so you're not.

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>>84758
BLOWEN THE FUCK OUT