1. If the equatorial distance between two meridians is 100 km, their distance at 600 latitude will be
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2. Pick up the incorrect statement from the following. In a spherical triangle
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3. According to Napier's Rules of circular parts for a right angled triangle, sine of middle part equals the product of
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4. In a spherical triangleABC, right angled at C, sin b equals
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5. In a spherical triangle ABC right angled at C, sin b equals to
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6. If S is the sum of three angles of a spherical triangle, the spherical excess equals
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7. The great circle whose plane is perpendicular to the axis of rotation of the earth, is called
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