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प्रश्न
Write down the co-ordinates of the image of the point (-2, 4) under reflection in the origin and under reflection in the y-axis. What is the distance between the points of reflection?
उत्तर
Let P be the point = (-2, 4 ).
Image under reflection in the origin P' = (2,-4)
Image under reflection in the y-axis p" = (2, 4)
Distance between points of reflection
= `sqrt ((4 - (-4))^2 + (2 - 2)^2)`
= `sqrt (8 ^2)`
= `sqrt 64`
= 8 units
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संबंधित प्रश्न
State the co-ordinates of the images of the following point under reflection in the x-axis:
(-7, 5)
State the co-ordinates of the images of the following point under reflection in the y-axis:
(2, 8)
State the co-ordinates of the images of the following point under reflection in the y-axis:
(-1,-3)
State the co-ordinates of the images of the following point under reflection in the y-axis:
(-5,-6)
State the co-ordinates of the images of the following point under reflection in the y-axis:
(-4, 7)
Name the figure formed by a triangle and its reflection, when:
An isosceles right-angled triangle is reflected in its hypotenuse.
Name the figure formed by a triangle and its reflection, when:
A right-angled triangle is reflected in its hypotenuse.
Name the figure formed by a triangle and its reflection, when:
A scalene triangle is reflected in its greatest side.
The point (3, 0) is invariant under reflection in:
Use graph sheet for this question. Take 2 cm = 1 unit along the axes.
- Plot A(0, 3), B(2, 1) and C(4, –1).
- Reflect point B and C in y-axis and name their images as B' and C' respectively. Plot and write coordinates of the points B' and C'.
- Reflect point A in the line BB' and name its images as A'.
- Plot and write coordinates of point A'.
- Join the points ABA'B' and give the geometrical name of the closed figure so formed.
