Earth's gravitational attraction keeps changing the direction of its movement continuously. This keeps orbits near Earth - such as the ISS - in an elliptical orbit.
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It is called a straight away answer given to a rhetorical question.
earth's orbit is elliptical with sun at its focus. when earth reach near to it ,earth travel faster and when far away its slower . therefore answer will depend on the which month you are considering. acc. to kleepner law area swept in a particular time is same.
Last year (2012), Pioneer 10 was 1.6*1010 kilometres from the earth. Pioneer 11 was 1.3*1010 km away.
The straight line distance from the Earth to Venus depends on their positions in their orbits. In terms of miles, Venus is 26 million miles away from the earth at its nearest, and 162 million miles at its furthest. Along these lines it would take between 49 and 308 years. Interplanetary journeys are not undertaken along such straight-line routes. Instead they follow a trajectory that is longer but requires less fuel through using the moon as a slingshot.
A right angle because 180* - 90* is 90* which is a right angle !