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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?
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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 :
(3 , -9)
State the co-ordinates of the images of the following point under reflection in the x-axis:
(-4,-8)
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:
(-5,-6)
State the co-ordinates of the images of the following point under reflection in the y-axis:
(-4, 7)
The points B and C have the co-ordinates (3, 2) and (0, 3). Find B', the image of B under the reflection in the x-axis and C', the image of C under the reflection in the line BB'.
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:
An isosceles triangle is reflected in its unequal side.
Use graph sheet to Solution this question. Take 2 cm = 1 unit alogn both the axes.
- Plot A, B, C where A(0, 4), B(1, 1) and C(4, 0)
- Reflect A and B on the x-axis and name them as E and D respectively.
- Reflect B through the origion and name it F. Write down the coordinates of F.
- Reflect B and C on the y-axis and name them as H and G respectively.
- Join points A, B, C, D, E, F, G, H and A in order and name the closed figure formed.
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.
