Lesson Notes By Weeks and Term v4 - JHS 1
Measurement
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Measurement
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Subject: Mathematics
Class: JHS 1
Term: 3rd Term
Week: 5
Grade code: B7.3.2.3.2
Strand code: 3
Sub-strand code: 2
Content standard code: B7.3.2.3
Indicator code: B7.3.2.3.2
Theme: GEOMETRY AND MEASUREMENT
Subtheme: Measurement
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This lesson introduces the concept of 'back bearing', which is a fundamental skill in navigation and surveying. Imagine you travel from your home in Accra to visit your grandmother in Kumasi. You know the direction to get there. But how do you find the exact direction to get back home? That's what back bearing is all about! It helps us find the return path of any journey. This skill is used by pilots flying between our cities, fishermen navigating the sea off the coast of Cape Coast, and surveyors who map out our land for new buildings and farms.
A. What is a Bearing? (A Quick Reminder)
Before we learn about back bearings, let's remember the three important rules for bearings: They are always measured from the North line. They are always measured in a clockwise direction. They are always written as a three-figure number (e.g., 60° is written as 060°).
B. What is a Back Bearing?
A back bearing (also called a reciprocal bearing) is the bearing of a starting point *from* a destination point. If the bearing of Kumasi from Accra is 045°, then the back bearing is the bearing of Accra from Kumasi. It's the exact opposite direction, the direction you would take to return to your starting point.