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yang no. 22.
Luas persegi= 10x10=100
Luas daerah yang di Arsir= 3/8 x Luas persegi
= 3/8x100=37,5
maaf juga kalo salah...
AC² = 12² + 8²
AC² = 144 + 64
AC² = 208
AC = √208
AC = √16√13
AC = 4√13
AD² = 9² + (4√13)²
= 81 + ( 16 x 13 )
= 81 + 208
= 289
AD = √289
= 17 cm ==> C