Back to: MATHEMATICS SS3

**Welcome to class! **

In today’s class, we will be talking more about longitude and latitude. Enjoy the class!

**Longitude and Latitude II**

**Calculation of distance between two points**

** 1. On the Longitude**

**The distance along the Great Circles:**

The radius of the earth is approximately 6400 KM. the distance between any two points on P and Q on a great circle is given by the formula

$ArcPQ=\theta /360\times 2\pi R$where o is the angular difference between points P and Q.

R is the radius of the earth.

**2. On the Latitude: **

**The distance along Parallel of Latitudes:**

The distance between any two points X and Y along a parallel of latitude is given by the formula

$XY=\theta /360\times 2\pi R\mathrm{cos}\theta $-
**Time or Speed of Aircraft:**

Time or speed of aircraft can be calculated after obtaining the distance by using the formulae of distances along longitude and latitude

$Timetaken=(Dis\mathrm{tan}ce)/speed$

We hope you enjoyed the class.

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