A coin is dropped from an 850 foot building. The velocity of the coin is v(t)=-16t. Find both the position function and acceleration function.

Explanation:

This can be proven by dividing the parallelogram into two triangles, and then proving the triangles congruent (use ASA). Once you know the triangles are congruent, then the corresponding pieces must be congruent as well. The corresponding pieces being the same length tells us that the opposite sides of a parallelogram are always congruent.