How many of the planets orbit the sun in the same direction as earth does?

All eight planets orbit in the same direction. Although not at the same speed they all orbit in the same direction. The terrestrial planets (Earth, Mars, Mercury and Venus) all orbit at a much faster rate because of their distance from the Sun. The Jovian planets or Gas giants (Jupiter, Neptune, Saturn, and Uranus) orbit the Sun much more slower because they're farther away from the Sun.
I hope this really helps a lot. Have a great day/night.

I'm pretty sure there's a geometry rule for   anyways, if the triangle is equilateral, and the circle is circumscribed, the circle is outside of the triangle.  to find the area, you need the radius.  the radius should be a straight line from the center of the triangle to any of it's points.  draw lines from the center of the circle to each of the triangle points.  draw three more lines from the center to the middle of the sides of the triangle.  you should now have six separate 30-60-90 triangles inside of your original triangle. use your 30-60-90 rules to solve for the radius, then the circumference.