\
The distance from the Sun to Earth is approximately .
The distance from the Sun to Venus is approximately .
The elongation angle is the angle formed between the line of sight from Earth to the Sun and the line of sight from Earth to Venus .
Consider the distance between the Earth and Venus as .
Draw a diagram for the situation:
\Observe the figure:
\Apply the Law of Sines for triangle :
and
.
.
.
\
Apply the Law of Sines for triangle for
: \ \
.
Apply the Law of Sines for triangle for
.
.
Thus, possible distances between Earth and Venus are approximately or
.
\
Possible distances between Earth and Venus are approximately or
.