CLASS: JSS 2
TERM: 3rd TERM
CONTENT: i. Compass bearing
iii. Finding the bearing of a point from another
A bearing gives the direction between two points in terms of an angle in degrees. The two types of bearing are compass bearing and three- figure bearings.
The four major compass directions are North (N) South (S) East (E) and West (W)
In compass bearing, the angles are measured from north to south depending on which one is nearer
Apart from the four main points or directions, there are also four main secondary direction i.e. NE (north east), SE (south east), SW (south west), NW (north west). The angles between each point is 45o
Draw a sketch to show each of these bearings marketing the angles clearly.
In a), the direction start from a wrong point (W) instead of N, therefore,
90 – 18 = 72o
In b), the direction starts from a wrong point (E) instead of S therefore:
90 – 55 = 35o i.e. S35oE
Evaluation: Class Work
Find the compass direction of point A from point O in these diagrams.
NGM BK CHAPTER 23, page 185 – 187
Essential Mathematics for JSS BK 2, CHAPTER 24, pg 246-247
Three-figure bearings are given as the number of degrees from north, measured in a clockwise direction. Any direction can be given as a three figure bearing. Three digit are always given but angles less than 100o need extra zero to be written in front of the digits e.g. 008o, 060o, 070o up to 099o
Find the three figure bearings of A, B, C, and D from X.
In the figure below, find the bearings of A, B, C and D from X.
NGM Bk. 2 Chapter 23, page 180 – 190.
To find the bearing of B from A
By constructing line N2A
180 + 57 = 237o GENERAL EVALUATION From a point P the bearing of a house is 060o. From a point Q 100m due east of P, the bearing is 330o. Draw a labeled sketch to show the positions of P, Q and the house. REVISION QUESTION WEEKEND ASSIGNMENT
180 + 57 = 237o
From a point P the bearing of a house is 060o. From a point Q 100m due east of P, the bearing is 330o.
Draw a labeled sketch to show the positions of P, Q and the house.
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