Unit Test #29

Select your answers to the following 10 questions from the pop-up menus in the right hand column. Clicking the "Begin Test Again" button will clear all the answers.





Under an enlargement the number of invariant points is A. 0
B. 1
C. 2
D. infinite
Answer 1:




In the diagram, the small rectangle is enlarged, centre O. 
What is the scale factor?
A. 2
B. 4
C. 8
D. 16
Answer 2:




The scale factor for an enlargement is 0.5. Compared to the object, the image is:
A. smaller
B. larger
C. the same size
D. neither of the above
Answer 3:



A line AB is 7 cm long. Under an enlargement with a scale 
factor of 3, the length of the image of AB is
A. 10 cm
B. 21 cm
C. 4 cm
D. 49 cm
Answer 4:




If a square has sides 3.5 m long and its image under an enlargement 
has sides 14 m long, what is the scale factor for the enlargement?
A. 4
B. 16
C. 49
D. 3
Answer 5:




What is the centre of the enlargement that maps triangle ADB to triangle EDC?
A. E
B. C
C. D
D. B
Answer 6:




What would the scale factor be for the enlargement described in question 6? A. 2
B. 0.5
C. 3
D. 0.25
Answer 7:




A shape and its image after an enlargement are: A. congruent
B. the same shape
C. parallel
D. perpendicular
Answer 8:




Under an enlargement, the centre of enlargement is: A. invariant
B. perpendicular
C. at right angles
D. parallel
Answer 9:




What is changed after an enlargement? A. colour
B. angles
C. shape
D. size
Answer 10: