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L setengah lingkaran (besar)
= 1/2 x Π (phi)x r²
= 1/2 x 3,14 x 10,5 cmx 10,5cm
=173,0925 cm²
L 1/2 lingkaran (kecil)
= 1/2 x Π x r²
= 1/2 x 3,14 x 3,5 cm x 3,5 cm
= 19,2325 cm²
L diarsir = L1/2 lingkaran besar - L1/2 lingkaran kecil
= 173,0925cm² - 19,2325cm²
= 153,86 cm²