Math Problem Statement

X is due north of Y and 2km distant. Z is due east of Y and has a bearing of S35°12'E from X. How far, to the nearest metre, is Z from X?

Solution

We are tasked with determining the distance from point ZZ to point XX, given the following conditions:

  • XX is due north of YY, and the distance between XX and YY is 2 km.
  • ZZ is due east of YY and has a bearing of S3512ES 35^\circ 12' E (or 351235^\circ 12' south of east) from XX.

Step-by-Step Approach:

  1. Bearings and Coordinates Setup:

    • Place YY at the origin (0,0)(0,0).
    • Since XX is due north of YY, XX is at the point (0,2)(0, 2) km.
    • Since ZZ is due east of YY, its position is along the x-axis at some point (d,0)(d, 0), where dd is the unknown distance between YY and ZZ.
  2. Using the Bearing:

    • The bearing S3512ES 35^\circ 12' E from XX to ZZ gives the angle between the line from XX to ZZ and the southward direction from XX. This angle is measured clockwise from south, and it translates into an angle of 903512=544890^\circ - 35^\circ 12' = 54^\circ 48' with the horizontal (x-axis) in standard position.
  3. Trigonometric Relations:

    • Using the law of sines or basic trigonometry, we can establish the relationships between the distances. Since we know the angle and the positions, we can form the right triangle and solve for the unknown distance.

I'll calculate the distance now.The distance from point ZZ to point XX is approximately 3,470 meters.

Would you like further details or have any questions?

Here are 5 related questions for deeper understanding:

  1. How do we interpret bearings when solving geometry problems like this one?
  2. Can the law of sines or cosines be used in problems involving bearings?
  3. What are other methods to solve right-angled triangle problems in navigation?
  4. How do we convert between degrees, minutes, and radians when calculating angles?
  5. Why is trigonometry useful for solving navigation-related distance problems?

Tip: When solving problems involving bearings, always ensure you understand the reference direction (e.g., north, east) to set up the triangle correctly.

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Math Problem Analysis

Mathematical Concepts

Geometry
Trigonometry
Bearings

Formulas

Distance formula
Trigonometric functions (sine, cosine, tangent)

Theorems

Right Triangle Trigonometry
Law of Sines

Suitable Grade Level

Grades 9-12