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=1/4 * π * r *r
=1/4 * 3,14 *20 cm * 20 cm
=314 cm2
Luas persegi panjang
=panjang * lebar
=20 cm * 8 cm
=160 cm2
luas bangun gabungan
=luas 1/4 lingkaran + luas persegi panjang
=314 cm2 + 160 cm2
=474 cm2