6/14=x/20 cross multiply and get 14x=120 divide and get 8 2/30
Consider the attached ellipse. Let the sun be at the right focus. Then perihelion is at right vertex on the x-axis and aphelion is at the left vertex on the x-axis.
The distances:
- from perihelion to the sun in terms of ellipse is a-c;
- from aphelion to the sun in terms of ellipse is a+c.
Then

Add these two equations:
and subtract first equation from the second:
Note that
thus

The equation for the planet's orbit is

<em>km</em>=<em>x, </em>the product being represented by <em>x.
</em><em>
</em>
Well when you add up all three angles of a triangle you should get 180 degrees.