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Solve for y

 Dec 6, 2018
 #1
avatar+203 
+10

Equilateral triangles have all equal sides and angles.

180 deg is in one triangle and divide it among the 3 sides and you get 60 deg.

 

So,

5y+10=60

y=10

 Dec 6, 2018
 #2
avatar+792 
0

This is an equilateral triangle because all the sides are the same. The angle measures are 60.

\(5y+10=60, 5y=50, y=10\) so y is 10 degrees.

Notice we didn't even use x.

 

You are very welcome!

:P

 Dec 6, 2018

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