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Luas Persegi-Luas setengah lingkaran
(40 x 40) - 1/2 x 22/7 x 14 x 14
1600 - 308
1292 cm 2
r=14 berarti d=28
keliling:
1/2 lingkaran = 1/2 x 22/7 x 28= 44cm
keliling seluruhnya= 26+ 26 + 44 + 26 + 26 = 148cm