Question

Which one of the answer figures will complete the sequence of the three problem figures ?

• A.

  

• B.

  

• C.

  

• D.

  

Hint:

Watch the position of the right angle of the triangle in each figure: it moves from corner to corner in a fixed direction, and the lines inside the triangle turn along with it.

Answer 1

The Correct Option is A

In the first problem figure the right angle of the triangle is at the bottom left corner. In the second figure it is at the bottom right, and in the third at the top right.
So the whole figure, together with all the lines inside it, turns by 90 degrees anticlockwise from one figure to the next (bottom left, bottom right, top right).
The next figure must therefore have the right angle at the top left corner, with the horizontal leg along the top and the vertical leg down the left side, and with the inner lines turned by another 90 degrees anticlockwise.
Only Option (1) has the right angle at the top left. Option (2) has it at the top right, Option (3) at the bottom left and Option (4) at the bottom right, so they are not the next figure.
Answer: (1) Option (1) figure