28. diket : sudut KOL = 72° jari jari = 14 sudut KOL 72° --------------------------- x luas lingkaran = -------------------- x luas lingkaran 360° 360°
* luas lingkaran πr² = 22/7 x 14² = 616 cm
72° --------------- x 616 = 123,2 cm² (c) 360°
29. (CF x AB) + (FB x DC) ( 2 x 9 ) + ( 4 x 6 ) EF= ------------------------- = --------------------------------- AD (4 + 2) = 6
28. diket : sudut KOL = 72°
jari jari = 14
sudut KOL 72°
--------------------------- x luas lingkaran = -------------------- x luas lingkaran
360° 360°
* luas lingkaran
πr² = 22/7 x 14² = 616 cm
72°
--------------- x 616 = 123,2 cm² (c)
360°
29. (CF x AB) + (FB x DC) ( 2 x 9 ) + ( 4 x 6 )
EF= ------------------------- = ---------------------------------
AD (4 + 2) = 6
18 + 24 42
------------------------- = --------------- = 7 (c)
6 6