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luas abc = 1/4 ×3,14 ×10×10=78,5cm²
luas efb = 1/4×3,14×6×6=28,26
luas daerah yang diarsir = 78,5-28,26=50,24cm²
keliling yang diarsir
EF = 1/4×3,14×2×6=9,42cm
AC = 1/4×2×3,14×4=6,28cm
AE+EF+FC+CA = 4++9,42+6,28+4=23,7 cm