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rumus 1 : luas setengah lingkaran
phi X r X r : 2 = 3,14 X 5 X 5 : 2
= 3,14 X 25 : 2
= 78,5 : 2
= 39,25 cm2
rumus 2 : luas persegi
s X s = 11 X 11
= 121 cm2
Luas bagian yg diarsir = rumus 2 - rumus 1
= 121 - 39,25
= 81,75 cm2