Question
The diagram shows two parallel lines intersected by two straight lines.
Find the values of a, b and c.
▶️ Answer/Explanation
Solution
Ans: a = 59, b = 37, c = 84
a = 59° (corresponding angles)
b = 180° – 143° = 37° (angles on straight line)
c = 180° – a – b = 180° – 59° – 37° = 84° (angles in triangle)
Question
On a map, the positions of the towns L, M and N form an equilateral triangle. The bearing of M from L is 103°.

Work out the bearing of L from N.
▶️ Answer/Explanation
Answer: 343°
In an equilateral triangle, all angles are 60°. Subtract 60° from the given bearing (103°) and adjust for compass direction to get 343°.