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Keliling = jumlah sisi + setengah lingkaran
= 42+42+42+ 66》(keliling setengah lingkaran= 22/7×1/2×2×21)
= 126+66
=192 cm
Luas= luas persegi-luas setengah lingkaran
=s×s - 1/2.phi. r.r
=42×42 - 1/2×22/7×21×21
=1764-693
=1071 cm2
SEMOGA MEMBANTU :)