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But we have 2 unknown sides

Oh, 20 + R and 120 + R

(100)^2 + ( 20 + R)^2 = (120 + R)^2

How about R3

two sides and an angle ;)

(30 + R3) * 0.5 = R3
15 + 0.5R3 = R3
0.5 R3 = 15
R3 = 30 ?

I think so

Find x by looking at the complete 120 line (i hope you can find it easily) ;)

I am dumb.

x= 20 ?

sum of these three will equal to????

30 + 10 + x = 60
x = 20 ? what am I mistaken in ?

@Michele_Laino , can't we use some drawing operations to find the center point ?

I recommend you to use a realease at least AutoCAD 2000, not AutoCAD LT 2000

That's it , if we know the radius of the circle :/ but it's unknown

|dw:1444414133266:dw|

The radius is perpendicular to the tangent line xD
Nice

@Michele_Laino , can't we find R_3 with some drawing operation like what you did ?

I'm thinking...

How about R_1 ?

I'm thinking...

go
http://openstudy.com/updates/5617f969e4b086e96bfdedad
as it started to lag here