Construct square inscribed in circle with the radius equal to one-half the length of .
Note: Drag the blue points to try different line segments.

Construct circle .
Bisect the length of . Use this length as the radius for circle .

Label a point on the circle point .

Construct the diameter of the circle.
Label the second point of intersection .

Construct the perpendicular bisector of .
Extend the bisector so it intersects the circle in two places.
Label the points of intersection and .

Construct the sides of the square.
Do not erase any of your markings.
Quadrilateral is a square inscribed in circle .

This applet is provided by Walch Education as supplemental material for their mathematics programs. Visit www.walch.com for more information on their resources.