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# G:\Panitia\Presentation Earth As A Sphere

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Earth As A Sphere

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### G:\Panitia\Presentation Earth As A Sphere

1. 1. MATHEMATICS FORM 5 EARTH AS A SPHERE
2. 2. INTRODUCTION
3. 3. NORTH POLE SOUTH POLE EAST WEST LONGITUDE LATITUDE MALAYSIA ●
4. 4. Great circle is any circle that passes through the north and the south poles or with the center as the centre of the earth. GREAT CIRCLE ● O N S
5. 5. One-half of a great circle joining the North and the South Poles is called a meridian. Longitude of a meridian is determined by the angle between its plane and the plane for Greenwich Meridian (east or west). Greenwich Meridian 0 o LONGITUDE S S N ● O O
6. 6. Example : G is stated on the Greenwich Meridian . L is 80 o to the right of G. So the longitude of L is 80 o E . K is 60 o to the left of G. So the longitude of K is 60 o W. K and M is a diameter of a circle centred C. KCM = 180 o . So Longitude M is 120 o E N
7. 7. EXERCISE 1: State the longitude of (a) dan (b) <ul><li>100 o E / 100 o W </li></ul><ul><li>80 o E / 180 o W </li></ul>(a) (b) N E
8. 8. Where is our country, Malaysia stated ?
9. 9. The Great Circle which the plane are perpendicular to the poles is known as the equator Marked as 0 o North direction N S 0 o South direction <ul><li>The circle with plane which are parallel to the equator plane is known as parallel of latitude </li></ul>LATITUDE
10. 10. Latitude Get further information about latitude and longitude at the following address: http://www-spof.gsfc.nasa.gov/stargaze/Slatlong.htm
11. 11. Latitude Of a Point Latitude is an angle at the centre of the earth that subtended by a meridian beginning from the equator to the parallel of latitude which is either to the North or to the South of the equator. Latitude A is 50 o N ● A Latitude B is 10 o S ● B NORTH SOUTH EQUATOR
12. 12. Look at the angle made by equator plane and parallel latitude 60 o N The angle between the equator plane and the north plane is 90 o N N N N S S S S
13. 13. Example : Based on the diagram, O is the centre of the earth State the latitude of point (a) W (b) X (c) Y Solution: (a) W is 72 o to the north equator. So the latitude for W is 72 o N. (b) X is 65 o to the south equator So the latitude for X is 65 o S. (c) Y is located at the same parallel latitude with W. Thus, latitude for Y is 72 o U.
14. 14. Exercise 2 : State the latitude of the following point : 1. Latitude Q is 3. Latitude L is 2. Latitude P is Q N 68 o N 55 o N 68 o N 68 o S 55 o S 55 o N
15. 15. Location Of A Place Location of a place at the surface of the earth can be determine by its latitude and longitude For example, based on the above figure Paris is located at point P Location of Paris is written as (48 o 50’ N,20 o 20’ E) What is the location of Q ?
16. 16. LONGITUDE = 100 O E LATITUDE = 5 O N MALAYSIA ( 5 O N, 100 O E )
17. 17. With That Go For Success We will meet again at the next topic