Math Problem Statement

1. A man starts walking towards the south. After walking for 10 m, he turns left at a right angle. Then after walking for 15 m, he again turns left at a right angle. In what direction is he finally walking? 2. If the girl is facing North, then: (a) In which direction and how far is the point C from point B? (b) In which direction is the point D? (c) Through what angle should the girl turn to face the point F?

Solution

Let's solve the given questions in the image.


Question 1:

A man starts walking towards the south. After walking for 10 m, he turns left at a right angle. Then after walking for 15 m, he again turns left at a right angle. In what direction is he finally walking?

  • Solution:

    • Initially, the man is walking South.
    • After walking 10 m, he turns left, so now he is walking East.
    • Then, after walking 15 m, he again turns left, so now he is walking North.
  • Answer: North (option (a)).


Question 2:

If the girl is facing North, then: (a) In which direction and how far is the point C from point B?
(b) In which direction is the point D?
(c) Through what angle should the girl turn to face the point F?

Part (a):

  • From the diagram, point C is 40 m to the North-East of point B.

  • Using Pythagoras’ theorem, the distance between B and C can be calculated:

    • BC=40mBC = 40 \, \text{m} (as it is explicitly mentioned in the question).
  • Answer: Point C is 40 m to the North-East of point B.

Part (b):

  • From the diagram, point D is directly to the South-East of the girl.
  • Answer: Point D is in the South-East direction.

Part (c):

  • To face point F, the girl needs to turn from facing North to South-East.

  • The angle of turn required is 18060=120180^\circ - 60^\circ = 120^\circ (clockwise).

  • Answer: The girl should turn 120° clockwise to face point F.


Would you like detailed step-by-step calculations for any of the above solutions? Let me know!


Related Questions:

  1. If the man turned right instead of left in Question 1, which direction would he end up walking?
  2. What is the shortest distance from point B to point D based on the diagram?
  3. How would the direction to point F change if the girl initially faced South?
  4. What angle should the girl turn if she initially faced East to face point C?
  5. Calculate the distance between points C and D using their directions.

Tip:

When solving directional problems, always sketch the directions step by step to avoid confusion and ensure accuracy.

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Math Problem Analysis

Mathematical Concepts

Directional reasoning
Pythagoras' theorem
Angles of rotation

Formulas

Pythagoras' theorem: a^2 + b^2 = c^2
Angle calculation: Final Angle = Initial Angle ± Turn Angle

Theorems

Pythagoras' Theorem

Suitable Grade Level

Grades 6-8