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In the following diagram, angle POQ = 55°, OQ = QP and the bearing of Q from O is 060°. Find the bearing of (a) O from Q. (b) P from Q.

Mathematics

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Answers

2 parts
a

240∘240^\circ

b

310∘310^\circ

Step-by-step solution

5 steps

Okay, chandamuleyi, let's work through this bearing problem.

Given Information:

  • Angle POQ = 55∘55^\circ (This is ∠QOP\angle QOP in the triangle).
  • OQ = QP (This means triangle OQP is an isosceles triangle).
  • Bearing of Q from O is 060∘060^\circ.

Part a· 2 steps

Find the bearing of O from Q.

  1. Use the given bearing of Q from O.

    The bearing of Q from O is 060∘060^\circ.

  2. Calculate the back bearing.

    To find the bearing of O from Q, we use the rule for back bearings. If the bearing is less than 180∘180^\circ, add 180∘180^\circ. If it's greater than 180∘180^\circ, subtract 180∘180^\circ.
    Since 060∘<180∘060^\circ < 180^\circ, we add 180∘180^\circ.

    Bearing of O from Q=060∘+180∘=240∘\text{Bearing of O from Q} = 060^\circ + 180^\circ = 240^\circ

    The bearing of O from Q is:

    240∘\boxed{240^\circ}

Part b

310∘310^\circ

Find the bearing of P from Q.

  1. Determine the angles within triangle OQP.

    Since OQ = QP, triangle OQP is an isosceles triangle with base OP. This means the angles opposite the equal sides are equal: ∠QPO=∠QOP\angle QPO = \angle QOP.
    We are given ∠POQ=55∘\angle POQ = 55^\circ, so ∠QOP=55∘\angle QOP = 55^\circ.
    Therefore, ∠QPO=55∘\angle QPO = 55^\circ.

  2. Calculate the angle ∠OQP\angle OQP.

    The sum of angles in a triangle is 180∘180^\circ.

    ∠OQP=180∘−(∠QOP+∠QPO)\angle OQP = 180^\circ - (\angle QOP + \angle QPO) ∠OQP=180∘−(55∘+55∘)\angle OQP = 180^\circ - (55^\circ + 55^\circ) ∠OQP=180∘−110∘\angle OQP = 180^\circ - 110^\circ ∠OQP=70∘\angle OQP = 70^\circ
  3. Calculate the bearing of P from Q.

    We know the bearing of O from Q is 240∘240^\circ. This is the angle measured clockwise from the North line at Q to the line segment QO.
    From the diagram, the line segment QP is clockwise from the line segment QO.
    Therefore, to find the bearing of P from Q, we add ∠OQP\angle OQP to the bearing of O from Q.

    Bearing of P from Q=Bearing of O from Q+∠OQP\text{Bearing of P from Q} = \text{Bearing of O from Q} + \angle OQP Bearing of P from Q=240∘+70∘\text{Bearing of P from Q} = 240^\circ + 70^\circ Bearing of P from Q=310∘\text{Bearing of P from Q} = 310^\circ

    The bearing of P from Q is:

    310∘\boxed{310^\circ}
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