Cotonou and Niamey are on the same line of longitude and Niamey is 7o north...

WAEC 1988

Cotonou and Niamey are on the same line of longitude and Niamey is 7^o north of Cotonou. If the radius of the earth is 6400km, how far is Niamey north of Cotonou along the line of longitude, correct to the nearest kilometer? [Take π = 22/7]

A. 391km
B. 503km
C. 782km
D. 1006km
E. 2012km

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Correct Answer: Option C

Explanation

θ/360

* 2πR

7/360

* 2 *

22/7

* 6400 = 782km

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Cotonou and Niamey are on the same line of longitude and Niamey is 7o north...

Correct Answer: Option C

Explanation

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