| Which of the following statements about Great Circles are correct? |
| 1. Great Circle is an imaginary circle which divides the Earth into two equal hemispheres. |
| 2. Equator is the only Great Circle, which can be drawn on the Earth's surface. |
| 3. An arc of a great Circle on the surface of the Earth marks the .shortest distance between two points on the Earth. Select the correct answer using the codes given below: |
A) 1 and 2
B) 1 and 3
C) 2 and 3
D) None of the above
Correct Answer: B
Solution :
[b] A great circle is defined as any circle drawn on a globe (or other sphere) with a centre that includes the centre of the globe. Thus, a great circle divides the globe into two equal halves. Since they must follow the circumference of the Earth to divide it, great circles are about 40,000 kilometres (24,854 miles) in length along meridians. At the equator though, a great circle is a little bit longer as the Earth is not a perfect sphere. In addition, great circles represent the shortest distance between two points anywhere on the Earth's surface. Because of this, great circles have been important in navigation for hundreds of years but their presence was discovered by ancient mathematicians.
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