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Earn +20 ptsQ: Are all parallels great circles
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Why is a great circle used for navigation?
Because any 'Great Circle' is the shortest distance across a sphere. Where the Earth is concerned , all the meridians and the Equator are Great Circles. The Plane of a 'Great Circles ' 'cut' the sphere into two equally sized hemispheres. NB Other than the Equator all the latitudes are NOT great Circles.
What parallels are not circles?
If two circles are drawn using the same centre, the two lines of the circles are parallel as they don't meet each other.Two straight lines (think of railway tracks) are drawn next to each other, but never meet, they are parallel lines.
Are all parallels equal?
Yes of course!
Why does Pi work for all circles?
Because all circles are similar.
Why are lines of longitude called great circles?
Because they make big circles around the Earth.
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