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= √ (100 - 36 )
= √64
= 8 cm
LuasTrapesium = (a+b) . t / 2
= ( 19 + 7 ) . 8 / 2
= 26 . 4
= 104 cm2
Luas balok = 19 . 14
= 256 cm2
Luas bangun total :
= Luas balok - Luas trapesium
= 256 - 104
= 152 cm2