Question 1142866
<pre>
Yes, This is an inscribed angle.  The measure of an inscribed angle is the
same as 1/2 the measure of a central angle subtending the same arc.

{{{drawing(400,400,-1.2,1.2,-1.2,1.2, circle(0,0,1),

line(-cos(40*pi/180),-sin(40*pi/180), cos(70*pi/180),sin(70*pi/180)),

line(-cos(40*pi/180),-sin(40*pi/180), cos(-10*pi/180),sin(-10*pi/180)),

line(0,0, cos(70*pi/180),sin(70*pi/180)),locate(-.54,-.35,40^o), locate(.2,.2,80^o),

line(0,0, cos(10*pi/180),-sin(10*pi/180)) )}}} 

Edwin</pre>