Mathematics
Grade9
Easy

Question

The angle between the north and west directions is ______.

  1. 120°
  2. 90°
  3. 45°
  4. 180°

hintHint:


Total angle between two intersecting lines = 360degree

The correct answer is: 90°




    Total angle between two intersecting lines = 360degree
    angle 1 space plus space angle 2 space plus space angle 3 space plus space angle 4 space equals space 360 degree
angle 1 space equals space angle 3 space a n d space angle 2 space equals space angle 4 space left parenthesis space A l t e r n a t e space I n t e r i o r space a n g l e s right parenthesis
2 angle 2 space plus space 2 angle 3 space equals space 360 degree
angle 2 space plus space angle 3 space equals space 180 degree
S i m i l a r l y space comma
angle 1 space plus space angle 4 space equals space 180 degree
T h u s comma space angle 1 space equals space angle 2 space equals space angle 3 space equals space angle 4 space equals space 90 degree
T h u s comma space t h e space a n g l e space b e t w e e n space t h e space n o r t h space a n d space w e s t space d i r e c t i o n s space i s space 90 degree.

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