Activity 4: Dilatations
Authored by Rinchen Dorji
Mathematics
9th Grade
CCSS covered
Used 6+ times
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10 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
What is a dilatation in geometric transformations?
A dilatation is a reflection in geometric transformations.
A dilatation is a translation in geometric transformations.
A dilatation in geometric transformations is a transformation that enlarges or reduces the size of a figure without changing its shape.
A dilatation is a rotation in geometric transformations.
Tags
CCSS.8.G.A.3
2.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
How do you calculate the scale factor of a dilatation?
Scale factor = Length of pre-image / Length of image
Scale factor = Perimeter of image / Perimeter of pre-image
Scale factor = Area of image / Area of pre-image
Scale factor = Length of image / Length of pre-image
Tags
CCSS.7.G.A.1
3.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
If a point has coordinates (2,3) and is dilated by a scale factor of 2 with centre (0, 0), what are the coordinates of the image point?
(1, 2)
(4, 6)
(5, 8)
(3, 5)
Tags
CCSS.8.G.A.3
4.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
If a figure is dilated with a scale factor greater than 1, how does the size of the image compare to the original figure?
It is larger
It is smaller
It is the same size
It depends on the figure
Tags
CCSS.8.G.A.3
5.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
Which transformation is described by the mapping notation (x, y) → (2x, 2y)?
Translation
Reflection
Rotation
Dilatation
Tags
CCSS.8.G.A.3
6.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
The size of a figure changes in a ___________________________.
Translation
Reflection
Rotation
Dilatation
Tags
CCSS.8.G.A.3
7.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
What is the mapping notation used for a dilatation?
(x, y) -> (kx, y)
(x, y) -> (x + k, y + k)
(x, y) -> (kx, ky)
(x, y) -> (x - k, y - k)
Tags
CCSS.8.G.A.3
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