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3 shaded parts makes a semi-circle.
1/2 X 3.14 X 26= 56.52 cm
18x 6 = 108cm
108 + 56.52 = 164.52cm
1/2 X 3.14 X 26= 56.52 cm
18x 6 = 108cm
108 + 56.52 = 164.52cm