Unit Test #22

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:





A square has an area of 4 units2
Under an enlargement, scale 
factor 2, what is the area of the image of the square
A. 8 units2
B. 16 units2
C. 32 units2
D. 64 units2

Answer 2:





The object and the image remain the same size in:
A. some enlargements
B. all enlargements
C. no enlargements
D. most enlargements

Answer 3:





A line AB is 7 cm long. Under an enlargement with a scale 
factor of 0.5, the length of the image of AB is
A. 35 cm
B. 3.5 cm
C. 14 cm
D. 7 cm

Answer 4:





If a square has sides 6 m long and its image under an enlargement 
has sides 15 m long, what is the scale factor for the enlargement?
A. 2.5
B. 9
C. 0.4
D. 90

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 enlargement are A. congruent
B. similar
C. parallel
D. perpendicular

Answer 8:



A line and its image under an enlargement are A. parallel
B. perpendicular
C. at right angles
D. unmoved

Answer 9:





Similar figures have A. equal angles
B. proportional sides
C. same shape
D. all of the above

Answer 10: