How do you write y=4x^2 -64x -265 in vertex form

4(x-8)^2 -521

A parallelogram is a polygon that has opposite side parallel and congruent. If you already know that two of the side lengths is 8 cm and 9 cm, the other two sides will also be 8 cm and 9 cm because it has 2 pairs of congruent sides. 8+8+9+9=34 cm for the perimeter.