Answer:
4.71 (corrected to 3 significant figures)
Step-by-step explanation:
12 is the diameter of the big semicircle and 6 for the small semicircle
the radii of the big and small circles are 6 and 3 cm respectively
(6/2 × 3.14) - (3/2 x 3.14) = 4.712388.. = 4.71
