Describe the architecture of the image above show? (be sure to clearly define the type of construction used) why was this type of architecture common amongst medieval castles?

The image shows a castle in quadrilateral format with the sides closed. In the upper part, there is a structure that allows the soldiers to lower themselves and to be hidden.  Around it there is a structure called Ameia which is an opening, on the parapet of the walls of a castle, where the defenders aimed at the enemy.

Around it there is a structure called Ameia which is an opening, on the parapet of the walls of a castle, where the defenders aimed at the enemy.

This type of architecture was common in medieval castles because it protected the castles from attacks from other kingdoms.

the answer is use of support  

lancelot said to the beautiful ellen i c u r a b u t l n (i see you are a beauty lancelot was the greatest and worst of the knights who became the king's champion and undertook quests in the king's name. he became the adulterous lover of queen guinevere, and they had a son named galahad.