Answer:
103 units
Explanation:
If we are allowed to assume that the "parts of a circle" are actually two halves of a circle, then the image has one whole circle and just a few sides of the squares. Perimeter means the distance around the outside. For circles we call the perimeter the circumference. So you may have studied a formula for circumference that is C = 2(pi)r or C = (pi)d. These circle (circle parts) have a radius of 10, because it is the same as the side of the square or a diameter of 20. Squares as you must know have all four sides being the same size. So since we have a whole circle if you put all the pieces together:
Perimeter=(pi)d + 4(10)
= (3.14)20 + 40
= 62.8 + 40
= 102.8
approximately = 103 units (that is rounded to the nearest whole unit)