Unit Test #21

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.

 

Q1:

How many invariant points are there usually under a rotation ? A. 0
B. 1
C. 2
D. infinite

Answer 1:

Q2:

A rotation of 90° is also called a  A. half-turn
B. quarter turn
C. three-quarter turn
D. full turn

Answer 2:

Q3:

P' is the image of (-3, 4) after a rotation of 180°about the origin.
The coordinates of P' are
A. (4, -3)
B. (3, -4)
C. (-4, 3)
D. (-4, -3)

Answer 3:

Q4:

What is the angle of rotation that maps the triangle AOB onto triangle COD?
A. 180°
B. 90°
C. -90°
D. -180°

Answer 4:

Q5:

In the diagram above, what angle of rotation would map the bottom triangle onto the top one?   A. 180°
B. 90°
C. -90°
D. 180°

Answer 5:

Q6:

A rotation of - 45° about (0, 0) is equivalent to a rotation about (0, 0) of:
A. 135°
B. 45°
C. 315°
D. 225°

Answer 6:

Q7:

A rotation of 45°followed by a rotation of -45°about the same point is equivalent to A. A half-turn
B. A quarter-turn
C. A rotation of 360°
D. A rotation of 90°

Answer 7:

Q8:

A shape and its image after rotation are A. congruent
B. different
C. parallel
D. perpendicular

Answer 8:

Q9:

A line and its image under a rotation of 180° are A. parallel
B. perpendicular
C. at right angles
D. unmoved

Answer 9:

Q10:

The image of the point (2, 1) after a rotation of 180°, centre (0, 0), is: A. (2, -1)
B. (-2, 1)
C. (2, 1)
D. (-2, -1)

Answer 10: