Since a pentagon has 5 sides, you would divide the perimeter by the number of sides.
641.5/5 = 128.3cm
Therefore, the length of one side of the pentagon is 128.3cm.
The length of each side of the square actually is 4 units. The area is 16 units squared and the perimeter is is ALSO 16.
Answer:
It is 105 degrees. Since 105-15=90 degrees.
