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= 78,5 cm2
L persegi = 10*10
= 100 cm2
L daerah yg d arsir
= 100 - 78,5
= 21,5 cm2
Kedua carilah luas lingkaran =3,14 x 5x5=3,14x25 =78,5
Jadi luas daerah yang diarsir =100-78,5 =21,5