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=2 x (p+l)
=2 x (12+10)
=2 x 22
=44 cm
K setengah lingkaran
=1/2 x 2 x phi x r
=1/2 x 2 x 3,14 x 4
=12,56
K yang diarsir
=K persegi pjng - K setengah lingkaran
=44-12,56
=31,44cm