question_answer 10)

Which direction will you face, if you start facing (a) East and makes \[\frac{1}{2}\]of a revolution, clockwise? (b) East and makes \[1\frac{1}{2}\] of a revolution, clockwise? (c) West and makes \[\frac{3}{4}\] of a revolution, anti-clockwise? (d) South and makes one full revolution? (Should we specify clockwise or anti-clockwise for this last question? Why not?) TIPS We know that, the angle between two adjacent directions is one right angle. Use this result to find required position.

Answer:

(a) We have, If we starts facing East and makes 1/2 of a revolution clockwise i.e. Two right angles, we will face West. (b) We have, If we starts facing East and makes \[1\frac{1}{2}\] of a revolution clockwise, i.e. One complete revolution and two right angles, we will face West. (c) We have, If we starts facing West and makes 3/4 of a revolution anti-clockwise. i.e. Three right angles, we will face North. (d) We have, If we starts facing South and makes one full revolution either clockwise or anti-clockwise, we will face South again. There is no need to specify clockwise or anti-clockwise for the last question because one full revolution will bring us back to the original position.