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luas 1/4 lingkaran
= 1/4 * 22/7 * 28 * 28*
= 1/4 * 22/1 * 4 * 28
= 22 * 28
= 616 cm2
5. jari jari lingkaran = 40 /2 =20 cm
luas lingkaran = 1/2 * 3.14 * 20 * 20
= 1/2 * 1.256
=628 cm2