The two semi circles come together to form one circle
Hence their total perimeter
C= πd ,d= 4 + 4 = 8
= π x 8
= 25.13 cm
Considering the perimeter b/n the two semi circles . That figures also form a square when combined perimeter of a square is P= 4L
With L =4
P= 4(4) = 16 cm
Hence the TOTAL Perimeter
= 16 + 25.13
= 41.13 cm