WOLFRAM

DEMONSTRATIONS
PROJECT
The Eyeball Theorem
radius
of
circle
with
center
:
U
2
V
1
AB
≈
1
.
00
CD
≈
1
.
00
U
V
A
B
C
D
Draw tangents from the centers U and V of the circles to the other circle. Then the lengths of AB and CD are equal.
You can drag the orange centers or use the sliders to change the figure.