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45derajat = 45/360 = 0,125 putaran
Luas = π r²
Luas (r = 6cm ) Penuh
= 3,14 x 36
= 113,04
Luas (r= 11cm) Penuh
= 3,14 x 11²
= 3,14 x 121
= 379,94cm
Luas diaksir = 0,125 ( 379,94 - 113,040)
= 0,125(266,9)
= 33,39 cm²