ABCD are four points in a plane and Q is the point of intersection of the lines joining the mid-points of AB and CD ; BC and AD. Show that PA→+PB→+PC→+PD→+=4PQ→ where P is any point.

ABCD are four points in a plane and Q is the point of intersection of the lines joining the mid-points of AB and CD ; BC and AD. Show that $\vec{P A} + \vec{P B} + \vec{P C} + \vec{P D} + = 4 \vec{P Q}$ where P is any point.

Mixed-up sentence exercise

Put the parts in order to form a sentence. When you think your answer is correct, click on "Check" to check your answer. If you get stuck, click on "Hint" to find out the next correct part.