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प्रश्न
Study the graph and answer each of the following:
- Write the coordinates of points A, B, C and D.
- Given that, point C is the image of point A. Name and write the equation of the line of reflection.
- Write the coordinates of the image of the point D under reflection in y-axis.
- Whats the name given to a point whose image is the point itself?
- On joining the points A, B, C, D and A in order, a figure is formed. Name the closed figure.
उत्तर
- A(3, 3), B(–2, 1), C(3, –1) and D(0, 1)
- BD and y = 1 is the line of reflection.
- D(0, 1)
- Invariant point.
- Concave Quadrilateral or Arrowhead.
APPEARS IN
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:
(-5,-6)
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'.
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?
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.
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.
